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Finding the Fourth Proportional to 1,143.24, 1,577.50 and 645.85

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Solution

The fourth proportional to 1,143.24, 1,577.50 and 645.85 is: 891.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.24 : 1,577.50 = 645.85 : x
  2. Step 2: Convert to fraction form
    1,143.24/1,577.50 = 645.85/x
  3. Step 3: Cross multiply
    1,143.24x = 1,577.50 × 645.85
  4. Step 4: Simplify right side
    1,143.24x = 1,018,828.38
  5. Step 5: Solve for x
    x = 1,018,828.38/1,143.24
  6. Step 6: Final answer
    x = 891.18

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1.5x scale

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.