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Finding the Fourth Proportional to 476.68, 715.02 and 391

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Solution

The fourth proportional to 476.68, 715.02 and 391 is: 586.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.68 : 715.02 = 391 : x
  2. Step 2: Convert to fraction form
    476.68/715.02 = 391/x
  3. Step 3: Cross multiply
    476.68x = 715.02 × 391
  4. Step 4: Simplify right side
    476.68x = 279,572.82
  5. Step 5: Solve for x
    x = 279,572.82/476.68
  6. Step 6: Final answer
    x = 586.50

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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.