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Finding the Fourth Proportional to 686.50, 947.12 and 424.46

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Solution

The fourth proportional to 686.50, 947.12 and 424.46 is: 585.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.50 : 947.12 = 424.46 : x
  2. Step 2: Convert to fraction form
    686.50/947.12 = 424.46/x
  3. Step 3: Cross multiply
    686.50x = 947.12 × 424.46
  4. Step 4: Simplify right side
    686.50x = 402,014.56
  5. Step 5: Solve for x
    x = 402,014.56/686.50
  6. Step 6: Final answer
    x = 585.60

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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.