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Finding the Fourth Proportional to 1,143, 1,575.88 and 847.76

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Solution

The fourth proportional to 1,143, 1,575.88 and 847.76 is: 1,168.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143 : 1,575.88 = 847.76 : x
  2. Step 2: Convert to fraction form
    1,143/1,575.88 = 847.76/x
  3. Step 3: Cross multiply
    1,143x = 1,575.88 × 847.76
  4. Step 4: Simplify right side
    1,143x = 1,335,968.03
  5. Step 5: Solve for x
    x = 1,335,968.03/1,143
  6. Step 6: Final answer
    x = 1,168.83

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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.