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Finding the Fourth Proportional to 988.68, 1,479.42 and 874.88

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Solution

The fourth proportional to 988.68, 1,479.42 and 874.88 is: 1,309.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    988.68 : 1,479.42 = 874.88 : x
  2. Step 2: Convert to fraction form
    988.68/1,479.42 = 874.88/x
  3. Step 3: Cross multiply
    988.68x = 1,479.42 × 874.88
  4. Step 4: Simplify right side
    988.68x = 1,294,314.97
  5. Step 5: Solve for x
    x = 1,294,314.97/988.68
  6. Step 6: Final answer
    x = 1,309.14

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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.