Home / 1,143.12-1,577.49-645.75

Finding the Fourth Proportional to 1,143.12, 1,577.49 and 645.75

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Solution

The fourth proportional to 1,143.12, 1,577.49 and 645.75 is: 891.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.12 : 1,577.49 = 645.75 : x
  2. Step 2: Convert to fraction form
    1,143.12/1,577.49 = 645.75/x
  3. Step 3: Cross multiply
    1,143.12x = 1,577.49 × 645.75
  4. Step 4: Simplify right side
    1,143.12x = 1,018,664.17
  5. Step 5: Solve for x
    x = 1,018,664.17/1,143.12
  6. Step 6: Final answer
    x = 891.13

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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.