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Finding the Fourth Proportional to 715.60, 1,071.57 and 471.38

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Solution

The fourth proportional to 715.60, 1,071.57 and 471.38 is: 705.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.60 : 1,071.57 = 471.38 : x
  2. Step 2: Convert to fraction form
    715.60/1,071.57 = 471.38/x
  3. Step 3: Cross multiply
    715.60x = 1,071.57 × 471.38
  4. Step 4: Simplify right side
    715.60x = 505,116.67
  5. Step 5: Solve for x
    x = 505,116.67/715.60
  6. Step 6: Final answer
    x = 705.87

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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.