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Finding the Fourth Proportional to 928.56, 1,281.01 and 555.42

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Solution

The fourth proportional to 928.56, 1,281.01 and 555.42 is: 766.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.56 : 1,281.01 = 555.42 : x
  2. Step 2: Convert to fraction form
    928.56/1,281.01 = 555.42/x
  3. Step 3: Cross multiply
    928.56x = 1,281.01 × 555.42
  4. Step 4: Simplify right side
    928.56x = 711,498.57
  5. Step 5: Solve for x
    x = 711,498.57/928.56
  6. Step 6: Final answer
    x = 766.24

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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.