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Finding the Fourth Proportional to 992.71, 1,488.05 and 646.74

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Solution

The fourth proportional to 992.71, 1,488.05 and 646.74 is: 969.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    992.71 : 1,488.05 = 646.74 : x
  2. Step 2: Convert to fraction form
    992.71/1,488.05 = 646.74/x
  3. Step 3: Cross multiply
    992.71x = 1,488.05 × 646.74
  4. Step 4: Simplify right side
    992.71x = 962,381.46
  5. Step 5: Solve for x
    x = 962,381.46/992.71
  6. Step 6: Final answer
    x = 969.45

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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.