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Finding the Fourth Proportional to 487.95, 731.91 and 145.95

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Solution

The fourth proportional to 487.95, 731.91 and 145.95 is: 218.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    487.95 : 731.91 = 145.95 : x
  2. Step 2: Convert to fraction form
    487.95/731.91 = 145.95/x
  3. Step 3: Cross multiply
    487.95x = 731.91 × 145.95
  4. Step 4: Simplify right side
    487.95x = 106,818.60
  5. Step 5: Solve for x
    x = 106,818.60/487.95
  6. Step 6: Final answer
    x = 218.92

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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.