Home / 7,815.20-10,784.76-4,278.20

Finding the Fourth Proportional to 7,815.20, 10,784.76 and 4,278.20

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Solution

The fourth proportional to 7,815.20, 10,784.76 and 4,278.20 is: 5,903.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,815.20 : 10,784.76 = 4,278.20 : x
  2. Step 2: Convert to fraction form
    7,815.20/10,784.76 = 4,278.20/x
  3. Step 3: Cross multiply
    7,815.20x = 10,784.76 × 4,278.20
  4. Step 4: Simplify right side
    7,815.20x = 46,139,360.23
  5. Step 5: Solve for x
    x = 46,139,360.23/7,815.20
  6. Step 6: Final answer
    x = 5,903.80

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Half scale
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Double scale
Find fourth proportional to 7,816.20, 10,786.14 and 4,279.20
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.