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Finding the Fourth Proportional to 757.18, 1,128.15 and 707.50

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Solution

The fourth proportional to 757.18, 1,128.15 and 707.50 is: 1,054.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    757.18 : 1,128.15 = 707.50 : x
  2. Step 2: Convert to fraction form
    757.18/1,128.15 = 707.50/x
  3. Step 3: Cross multiply
    757.18x = 1,128.15 × 707.50
  4. Step 4: Simplify right side
    757.18x = 798,166.13
  5. Step 5: Solve for x
    x = 798,166.13/757.18
  6. Step 6: Final answer
    x = 1,054.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.