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Finding the Fourth Proportional to 926.38, 1,278.41 and 553.58

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Solution

The fourth proportional to 926.38, 1,278.41 and 553.58 is: 763.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.38 : 1,278.41 = 553.58 : x
  2. Step 2: Convert to fraction form
    926.38/1,278.41 = 553.58/x
  3. Step 3: Cross multiply
    926.38x = 1,278.41 × 553.58
  4. Step 4: Simplify right side
    926.38x = 707,702.21
  5. Step 5: Solve for x
    x = 707,702.21/926.38
  6. Step 6: Final answer
    x = 763.94

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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.