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Finding the Fourth Proportional to 715.70, 988.00 and 520.70

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Solution

The fourth proportional to 715.70, 988.00 and 520.70 is: 718.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    715.70 : 988.00 = 520.70 : x
  2. Step 2: Convert to fraction form
    715.70/988.00 = 520.70/x
  3. Step 3: Cross multiply
    715.70x = 988.00 × 520.70
  4. Step 4: Simplify right side
    715.70x = 514,445.36
  5. Step 5: Solve for x
    x = 514,445.36/715.70
  6. Step 6: Final answer
    x = 718.80

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.