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Finding the Fourth Proportional to 710.42, 981.96 and 515.30

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Solution

The fourth proportional to 710.42, 981.96 and 515.30 is: 712.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    710.42 : 981.96 = 515.30 : x
  2. Step 2: Convert to fraction form
    710.42/981.96 = 515.30/x
  3. Step 3: Cross multiply
    710.42x = 981.96 × 515.30
  4. Step 4: Simplify right side
    710.42x = 506,003.99
  5. Step 5: Solve for x
    x = 506,003.99/710.42
  6. Step 6: Final answer
    x = 712.26

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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.