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Finding the Fourth Proportional to 955.80, 1,432.56 and 407.76

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Solution

The fourth proportional to 955.80, 1,432.56 and 407.76 is: 611.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.80 : 1,432.56 = 407.76 : x
  2. Step 2: Convert to fraction form
    955.80/1,432.56 = 407.76/x
  3. Step 3: Cross multiply
    955.80x = 1,432.56 × 407.76
  4. Step 4: Simplify right side
    955.80x = 584,140.67
  5. Step 5: Solve for x
    x = 584,140.67/955.80
  6. Step 6: Final answer
    x = 611.15

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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.