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Finding the Fourth Proportional to 928.13, 1,280.81 and 555.12

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Solution

The fourth proportional to 928.13, 1,280.81 and 555.12 is: 766.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.13 : 1,280.81 = 555.12 : x
  2. Step 2: Convert to fraction form
    928.13/1,280.81 = 555.12/x
  3. Step 3: Cross multiply
    928.13x = 1,280.81 × 555.12
  4. Step 4: Simplify right side
    928.13x = 711,004.64
  5. Step 5: Solve for x
    x = 711,004.64/928.13
  6. Step 6: Final answer
    x = 766.07

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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.