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Finding the Fourth Proportional to 7,875.76, 10,868.34 and 4,290.76

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Solution

The fourth proportional to 7,875.76, 10,868.34 and 4,290.76 is: 5,921.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,875.76 : 10,868.34 = 4,290.76 : x
  2. Step 2: Convert to fraction form
    7,875.76/10,868.34 = 4,290.76/x
  3. Step 3: Cross multiply
    7,875.76x = 10,868.34 × 4,290.76
  4. Step 4: Simplify right side
    7,875.76x = 46,633,438.54
  5. Step 5: Solve for x
    x = 46,633,438.54/7,875.76
  6. Step 6: Final answer
    x = 5,921.14

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Double scale
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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.