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Finding the Fourth Proportional to 766.48, 1,057.56 and 430.31

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Solution

The fourth proportional to 766.48, 1,057.56 and 430.31 is: 593.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    766.48 : 1,057.56 = 430.31 : x
  2. Step 2: Convert to fraction form
    766.48/1,057.56 = 430.31/x
  3. Step 3: Cross multiply
    766.48x = 1,057.56 × 430.31
  4. Step 4: Simplify right side
    766.48x = 455,079.67
  5. Step 5: Solve for x
    x = 455,079.67/766.48
  6. Step 6: Final answer
    x = 593.73

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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.