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Finding the Fourth Proportional to 847.32, 1,271.16 and 414.72

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Solution

The fourth proportional to 847.32, 1,271.16 and 414.72 is: 622.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.32 : 1,271.16 = 414.72 : x
  2. Step 2: Convert to fraction form
    847.32/1,271.16 = 414.72/x
  3. Step 3: Cross multiply
    847.32x = 1,271.16 × 414.72
  4. Step 4: Simplify right side
    847.32x = 527,175.48
  5. Step 5: Solve for x
    x = 527,175.48/847.32
  6. Step 6: Final answer
    x = 622.17

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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.