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Finding the Fourth Proportional to 926.89, 1,390.65 and 493.75

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Solution

The fourth proportional to 926.89, 1,390.65 and 493.75 is: 740.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.89 : 1,390.65 = 493.75 : x
  2. Step 2: Convert to fraction form
    926.89/1,390.65 = 493.75/x
  3. Step 3: Cross multiply
    926.89x = 1,390.65 × 493.75
  4. Step 4: Simplify right side
    926.89x = 686,633.44
  5. Step 5: Solve for x
    x = 686,633.44/926.89
  6. Step 6: Final answer
    x = 740.79

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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.