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Finding the Fourth Proportional to 710.10, 1,063.17 and 645.15

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Solution

The fourth proportional to 710.10, 1,063.17 and 645.15 is: 965.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.10 : 1,063.17 = 645.15 : x
  2. Step 2: Convert to fraction form
    710.10/1,063.17 = 645.15/x
  3. Step 3: Cross multiply
    710.10x = 1,063.17 × 645.15
  4. Step 4: Simplify right side
    710.10x = 685,904.13
  5. Step 5: Solve for x
    x = 685,904.13/710.10
  6. Step 6: Final answer
    x = 965.93

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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.