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Finding the Fourth Proportional to 926.98, 1,278.64 and 553.70

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Solution

The fourth proportional to 926.98, 1,278.64 and 553.70 is: 763.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.98 : 1,278.64 = 553.70 : x
  2. Step 2: Convert to fraction form
    926.98/1,278.64 = 553.70/x
  3. Step 3: Cross multiply
    926.98x = 1,278.64 × 553.70
  4. Step 4: Simplify right side
    926.98x = 707,983.74
  5. Step 5: Solve for x
    x = 707,983.74/926.98
  6. Step 6: Final answer
    x = 763.76

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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.