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Finding the Fourth Proportional to 1,002.39, 1,384.10 and 666.62

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Solution

The fourth proportional to 1,002.39, 1,384.10 and 666.62 is: 920.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,002.39 : 1,384.10 = 666.62 : x
  2. Step 2: Convert to fraction form
    1,002.39/1,384.10 = 666.62/x
  3. Step 3: Cross multiply
    1,002.39x = 1,384.10 × 666.62
  4. Step 4: Simplify right side
    1,002.39x = 922,658.49
  5. Step 5: Solve for x
    x = 922,658.49/1,002.39
  6. Step 6: Final answer
    x = 920.46

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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.