Home / 7,478.80-10,320.64-4,121.60

Finding the Fourth Proportional to 7,478.80, 10,320.64 and 4,121.60

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Solution

The fourth proportional to 7,478.80, 10,320.64 and 4,121.60 is: 5,687.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,478.80 : 10,320.64 = 4,121.60 : x
  2. Step 2: Convert to fraction form
    7,478.80/10,320.64 = 4,121.60/x
  3. Step 3: Cross multiply
    7,478.80x = 10,320.64 × 4,121.60
  4. Step 4: Simplify right side
    7,478.80x = 42,537,549.82
  5. Step 5: Solve for x
    x = 42,537,549.82/7,478.80
  6. Step 6: Final answer
    x = 5,687.75

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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.