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Finding the Fourth Proportional to 928.18, 1,281.01 and 555.16

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Solution

The fourth proportional to 928.18, 1,281.01 and 555.16 is: 766.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.18 : 1,281.01 = 555.16 : x
  2. Step 2: Convert to fraction form
    928.18/1,281.01 = 555.16/x
  3. Step 3: Cross multiply
    928.18x = 1,281.01 × 555.16
  4. Step 4: Simplify right side
    928.18x = 711,162.74
  5. Step 5: Solve for x
    x = 711,162.74/928.18
  6. Step 6: Final answer
    x = 766.19

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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.