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Finding the Fourth Proportional to 847.62, 1,272.51 and 619.20

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Solution

The fourth proportional to 847.62, 1,272.51 and 619.20 is: 929.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    847.62 : 1,272.51 = 619.20 : x
  2. Step 2: Convert to fraction form
    847.62/1,272.51 = 619.20/x
  3. Step 3: Cross multiply
    847.62x = 1,272.51 × 619.20
  4. Step 4: Simplify right side
    847.62x = 787,938.19
  5. Step 5: Solve for x
    x = 787,938.19/847.62
  6. Step 6: Final answer
    x = 929.59

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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.