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Finding the Fourth Proportional to 459.76, 688.65 and 427.71

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Solution

The fourth proportional to 459.76, 688.65 and 427.71 is: 640.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    459.76 : 688.65 = 427.71 : x
  2. Step 2: Convert to fraction form
    459.76/688.65 = 427.71/x
  3. Step 3: Cross multiply
    459.76x = 688.65 × 427.71
  4. Step 4: Simplify right side
    459.76x = 294,545.88
  5. Step 5: Solve for x
    x = 294,545.88/459.76
  6. Step 6: Final answer
    x = 640.65

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.