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Finding the Fourth Proportional to 928.35, 1,281.59 and 718.05

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Solution

The fourth proportional to 928.35, 1,281.59 and 718.05 is: 991.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.35 : 1,281.59 = 718.05 : x
  2. Step 2: Convert to fraction form
    928.35/1,281.59 = 718.05/x
  3. Step 3: Cross multiply
    928.35x = 1,281.59 × 718.05
  4. Step 4: Simplify right side
    928.35x = 920,247.49
  5. Step 5: Solve for x
    x = 920,247.49/928.35
  6. Step 6: Final answer
    x = 991.27

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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.