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Finding the Fourth Proportional to 1,140.32, 1,713.12 and 707.60

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Solution

The fourth proportional to 1,140.32, 1,713.12 and 707.60 is: 1,063.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,140.32 : 1,713.12 = 707.60 : x
  2. Step 2: Convert to fraction form
    1,140.32/1,713.12 = 707.60/x
  3. Step 3: Cross multiply
    1,140.32x = 1,713.12 × 707.60
  4. Step 4: Simplify right side
    1,140.32x = 1,212,203.71
  5. Step 5: Solve for x
    x = 1,212,203.71/1,140.32
  6. Step 6: Final answer
    x = 1,063.04

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.