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Finding the Fourth Proportional to 715.83, 1,071.92 and 655.68

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Solution

The fourth proportional to 715.83, 1,071.92 and 655.68 is: 981.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.83 : 1,071.92 = 655.68 : x
  2. Step 2: Convert to fraction form
    715.83/1,071.92 = 655.68/x
  3. Step 3: Cross multiply
    715.83x = 1,071.92 × 655.68
  4. Step 4: Simplify right side
    715.83x = 702,833.23
  5. Step 5: Solve for x
    x = 702,833.23/715.83
  6. Step 6: Final answer
    x = 981.84

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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.