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Finding the Fourth Proportional to 928.40, 1,281.13 and 555.55

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Solution

The fourth proportional to 928.40, 1,281.13 and 555.55 is: 766.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.40 : 1,281.13 = 555.55 : x
  2. Step 2: Convert to fraction form
    928.40/1,281.13 = 555.55/x
  3. Step 3: Cross multiply
    928.40x = 1,281.13 × 555.55
  4. Step 4: Simplify right side
    928.40x = 711,731.77
  5. Step 5: Solve for x
    x = 711,731.77/928.40
  6. Step 6: Final answer
    x = 766.62

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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.