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Finding the Fourth Proportional to 1,647.79, 2,472.71 and 988.95

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Solution

The fourth proportional to 1,647.79, 2,472.71 and 988.95 is: 1,484.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,647.79 : 2,472.71 = 988.95 : x
  2. Step 2: Convert to fraction form
    1,647.79/2,472.71 = 988.95/x
  3. Step 3: Cross multiply
    1,647.79x = 2,472.71 × 988.95
  4. Step 4: Simplify right side
    1,647.79x = 2,445,386.55
  5. Step 5: Solve for x
    x = 2,445,386.55/1,647.79
  6. Step 6: Final answer
    x = 1,484.04

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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.