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Finding the Fourth Proportional to 985.77, 1,479.56 and 499.17

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Solution

The fourth proportional to 985.77, 1,479.56 and 499.17 is: 749.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.77 : 1,479.56 = 499.17 : x
  2. Step 2: Convert to fraction form
    985.77/1,479.56 = 499.17/x
  3. Step 3: Cross multiply
    985.77x = 1,479.56 × 499.17
  4. Step 4: Simplify right side
    985.77x = 738,551.97
  5. Step 5: Solve for x
    x = 738,551.97/985.77
  6. Step 6: Final answer
    x = 749.21

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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.