Home / 1,143.16-1,577.10-645.66

Finding the Fourth Proportional to 1,143.16, 1,577.10 and 645.66

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Solution

The fourth proportional to 1,143.16, 1,577.10 and 645.66 is: 890.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,143.16 : 1,577.10 = 645.66 : x
  2. Step 2: Convert to fraction form
    1,143.16/1,577.10 = 645.66/x
  3. Step 3: Cross multiply
    1,143.16x = 1,577.10 × 645.66
  4. Step 4: Simplify right side
    1,143.16x = 1,018,270.39
  5. Step 5: Solve for x
    x = 1,018,270.39/1,143.16
  6. Step 6: Final answer
    x = 890.75

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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.