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Finding the Fourth Proportional to 872.40, 1,204.08 and 558.12

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Solution

The fourth proportional to 872.40, 1,204.08 and 558.12 is: 770.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    872.40 : 1,204.08 = 558.12 : x
  2. Step 2: Convert to fraction form
    872.40/1,204.08 = 558.12/x
  3. Step 3: Cross multiply
    872.40x = 1,204.08 × 558.12
  4. Step 4: Simplify right side
    872.40x = 672,021.13
  5. Step 5: Solve for x
    x = 672,021.13/872.40
  6. Step 6: Final answer
    x = 770.31

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Double scale
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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.