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Finding the Fourth Proportional to 847.32, 1,272.20 and 541.12

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Solution

The fourth proportional to 847.32, 1,272.20 and 541.12 is: 812.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.32 : 1,272.20 = 541.12 : x
  2. Step 2: Convert to fraction form
    847.32/1,272.20 = 541.12/x
  3. Step 3: Cross multiply
    847.32x = 1,272.20 × 541.12
  4. Step 4: Simplify right side
    847.32x = 688,412.86
  5. Step 5: Solve for x
    x = 688,412.86/847.32
  6. Step 6: Final answer
    x = 812.46

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.