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Finding the Fourth Proportional to 928.56, 1,281.84 and 718.24

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Solution

The fourth proportional to 928.56, 1,281.84 and 718.24 is: 991.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    928.56 : 1,281.84 = 718.24 : x
  2. Step 2: Convert to fraction form
    928.56/1,281.84 = 718.24/x
  3. Step 3: Cross multiply
    928.56x = 1,281.84 × 718.24
  4. Step 4: Simplify right side
    928.56x = 920,668.76
  5. Step 5: Solve for x
    x = 920,668.76/928.56
  6. Step 6: Final answer
    x = 991.50

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1.5x scale

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.