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Finding the Fourth Proportional to 1,042.74, 1,438.80 and 669.60

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Solution

The fourth proportional to 1,042.74, 1,438.80 and 669.60 is: 923.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,042.74 : 1,438.80 = 669.60 : x
  2. Step 2: Convert to fraction form
    1,042.74/1,438.80 = 669.60/x
  3. Step 3: Cross multiply
    1,042.74x = 1,438.80 × 669.60
  4. Step 4: Simplify right side
    1,042.74x = 963,417.97
  5. Step 5: Solve for x
    x = 963,417.97/1,042.74
  6. Step 6: Final answer
    x = 923.93

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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.