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Finding the Fourth Proportional to 928.45, 1,281.15 and 555.35

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Solution

The fourth proportional to 928.45, 1,281.15 and 555.35 is: 766.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.45 : 1,281.15 = 555.35 : x
  2. Step 2: Convert to fraction form
    928.45/1,281.15 = 555.35/x
  3. Step 3: Cross multiply
    928.45x = 1,281.15 × 555.35
  4. Step 4: Simplify right side
    928.45x = 711,480.25
  5. Step 5: Solve for x
    x = 711,480.25/928.45
  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.