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Finding the Fourth Proportional to 928.91, 1,281.90 and 514.91

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Solution

The fourth proportional to 928.91, 1,281.90 and 514.91 is: 710.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.91 : 1,281.90 = 514.91 : x
  2. Step 2: Convert to fraction form
    928.91/1,281.90 = 514.91/x
  3. Step 3: Cross multiply
    928.91x = 1,281.90 × 514.91
  4. Step 4: Simplify right side
    928.91x = 660,054.14
  5. Step 5: Solve for x
    x = 660,054.14/928.91
  6. Step 6: Final answer
    x = 710.57

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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.