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Finding the Fourth Proportional to 1,004.19, 1,384.68 and 689.61

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Solution

The fourth proportional to 1,004.19, 1,384.68 and 689.61 is: 950.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.19 : 1,384.68 = 689.61 : x
  2. Step 2: Convert to fraction form
    1,004.19/1,384.68 = 689.61/x
  3. Step 3: Cross multiply
    1,004.19x = 1,384.68 × 689.61
  4. Step 4: Simplify right side
    1,004.19x = 954,885.73
  5. Step 5: Solve for x
    x = 954,885.73/1,004.19
  6. Step 6: Final answer
    x = 950.90

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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.