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Finding the Fourth Proportional to 1,117.31, 1,541.77 and 638.77

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Solution

The fourth proportional to 1,117.31, 1,541.77 and 638.77 is: 881.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.31 : 1,541.77 = 638.77 : x
  2. Step 2: Convert to fraction form
    1,117.31/1,541.77 = 638.77/x
  3. Step 3: Cross multiply
    1,117.31x = 1,541.77 × 638.77
  4. Step 4: Simplify right side
    1,117.31x = 984,830.97
  5. Step 5: Solve for x
    x = 984,830.97/1,117.31
  6. Step 6: Final answer
    x = 881.43

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Half scale
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Double scale
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1.5x scale

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.