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Finding the Fourth Proportional to 765.32, 1,055.86 and 489.48

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Solution

The fourth proportional to 765.32, 1,055.86 and 489.48 is: 675.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    765.32 : 1,055.86 = 489.48 : x
  2. Step 2: Convert to fraction form
    765.32/1,055.86 = 489.48/x
  3. Step 3: Cross multiply
    765.32x = 1,055.86 × 489.48
  4. Step 4: Simplify right side
    765.32x = 516,822.35
  5. Step 5: Solve for x
    x = 516,822.35/765.32
  6. Step 6: Final answer
    x = 675.30

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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.