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Finding the Fourth Proportional to 686.72, 947.72 and 424.88

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Solution

The fourth proportional to 686.72, 947.72 and 424.88 is: 586.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    686.72 : 947.72 = 424.88 : x
  2. Step 2: Convert to fraction form
    686.72/947.72 = 424.88/x
  3. Step 3: Cross multiply
    686.72x = 947.72 × 424.88
  4. Step 4: Simplify right side
    686.72x = 402,667.27
  5. Step 5: Solve for x
    x = 402,667.27/686.72
  6. Step 6: Final answer
    x = 586.36

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1.5x scale

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.