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Finding the Fourth Proportional to 687.12, 947.80 and 424.92

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Solution

The fourth proportional to 687.12, 947.80 and 424.92 is: 586.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    687.12 : 947.80 = 424.92 : x
  2. Step 2: Convert to fraction form
    687.12/947.80 = 424.92/x
  3. Step 3: Cross multiply
    687.12x = 947.80 × 424.92
  4. Step 4: Simplify right side
    687.12x = 402,739.18
  5. Step 5: Solve for x
    x = 402,739.18/687.12
  6. Step 6: Final answer
    x = 586.13

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Double scale
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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.