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Finding the Fourth Proportional to 926.98, 1,390.70 and 762.71

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Solution

The fourth proportional to 926.98, 1,390.70 and 762.71 is: 1,144.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.98 : 1,390.70 = 762.71 : x
  2. Step 2: Convert to fraction form
    926.98/1,390.70 = 762.71/x
  3. Step 3: Cross multiply
    926.98x = 1,390.70 × 762.71
  4. Step 4: Simplify right side
    926.98x = 1,060,700.80
  5. Step 5: Solve for x
    x = 1,060,700.80/926.98
  6. Step 6: Final answer
    x = 1,144.25

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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.