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Finding the Fourth Proportional to 1,142.87, 1,577.13 and 645.51

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Solution

The fourth proportional to 1,142.87, 1,577.13 and 645.51 is: 890.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.87 : 1,577.13 = 645.51 : x
  2. Step 2: Convert to fraction form
    1,142.87/1,577.13 = 645.51/x
  3. Step 3: Cross multiply
    1,142.87x = 1,577.13 × 645.51
  4. Step 4: Simplify right side
    1,142.87x = 1,018,053.19
  5. Step 5: Solve for x
    x = 1,018,053.19/1,142.87
  6. Step 6: Final answer
    x = 890.79

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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.