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Finding the Fourth Proportional to 1,002.79, 1,384.23 and 689.68

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Solution

The fourth proportional to 1,002.79, 1,384.23 and 689.68 is: 952.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.79 : 1,384.23 = 689.68 : x
  2. Step 2: Convert to fraction form
    1,002.79/1,384.23 = 689.68/x
  3. Step 3: Cross multiply
    1,002.79x = 1,384.23 × 689.68
  4. Step 4: Simplify right side
    1,002.79x = 954,675.75
  5. Step 5: Solve for x
    x = 954,675.75/1,002.79
  6. Step 6: Final answer
    x = 952.02

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.