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Finding the Fourth Proportional to 1,143, 1,577.37 and 645.55

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Solution

The fourth proportional to 1,143, 1,577.37 and 645.55 is: 890.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143 : 1,577.37 = 645.55 : x
  2. Step 2: Convert to fraction form
    1,143/1,577.37 = 645.55/x
  3. Step 3: Cross multiply
    1,143x = 1,577.37 × 645.55
  4. Step 4: Simplify right side
    1,143x = 1,018,271.20
  5. Step 5: Solve for x
    x = 1,018,271.20/1,143
  6. Step 6: Final answer
    x = 890.88

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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.