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Finding the Fourth Proportional to 686.66, 946.19 and 529.31

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Solution

The fourth proportional to 686.66, 946.19 and 529.31 is: 729.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.66 : 946.19 = 529.31 : x
  2. Step 2: Convert to fraction form
    686.66/946.19 = 529.31/x
  3. Step 3: Cross multiply
    686.66x = 946.19 × 529.31
  4. Step 4: Simplify right side
    686.66x = 500,820.45
  5. Step 5: Solve for x
    x = 500,820.45/686.66
  6. Step 6: Final answer
    x = 729.36

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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.