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Finding the Fourth Proportional to 928.07, 1,280.85 and 555.25

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Solution

The fourth proportional to 928.07, 1,280.85 and 555.25 is: 766.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.07 : 1,280.85 = 555.25 : x
  2. Step 2: Convert to fraction form
    928.07/1,280.85 = 555.25/x
  3. Step 3: Cross multiply
    928.07x = 1,280.85 × 555.25
  4. Step 4: Simplify right side
    928.07x = 711,189.19
  5. Step 5: Solve for x
    x = 711,189.19/928.07
  6. Step 6: Final answer
    x = 766.31

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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.