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Finding the Fourth Proportional to 1,139.84, 1,708.70 and 446.88

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Solution

The fourth proportional to 1,139.84, 1,708.70 and 446.88 is: 669.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.84 : 1,708.70 = 446.88 : x
  2. Step 2: Convert to fraction form
    1,139.84/1,708.70 = 446.88/x
  3. Step 3: Cross multiply
    1,139.84x = 1,708.70 × 446.88
  4. Step 4: Simplify right side
    1,139.84x = 763,581.62
  5. Step 5: Solve for x
    x = 763,581.62/1,139.84
  6. Step 6: Final answer
    x = 669.91

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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.