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Finding the Fourth Proportional to 985.71, 1,479.47 and 499.10

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Solution

The fourth proportional to 985.71, 1,479.47 and 499.10 is: 749.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    985.71 : 1,479.47 = 499.10 : x
  2. Step 2: Convert to fraction form
    985.71/1,479.47 = 499.10/x
  3. Step 3: Cross multiply
    985.71x = 1,479.47 × 499.10
  4. Step 4: Simplify right side
    985.71x = 738,393.58
  5. Step 5: Solve for x
    x = 738,393.58/985.71
  6. Step 6: Final answer
    x = 749.10

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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.