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Finding the Fourth Proportional to 476.86, 715.40 and 147.79

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Solution

The fourth proportional to 476.86, 715.40 and 147.79 is: 221.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    476.86 : 715.40 = 147.79 : x
  2. Step 2: Convert to fraction form
    476.86/715.40 = 147.79/x
  3. Step 3: Cross multiply
    476.86x = 715.40 × 147.79
  4. Step 4: Simplify right side
    476.86x = 105,727.55
  5. Step 5: Solve for x
    x = 105,727.55/476.86
  6. Step 6: Final answer
    x = 221.72

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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.