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Finding the Fourth Proportional to 1,139.59, 1,712.60 and 677.45

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Solution

The fourth proportional to 1,139.59, 1,712.60 and 677.45 is: 1,018.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,139.59 : 1,712.60 = 677.45 : x
  2. Step 2: Convert to fraction form
    1,139.59/1,712.60 = 677.45/x
  3. Step 3: Cross multiply
    1,139.59x = 1,712.60 × 677.45
  4. Step 4: Simplify right side
    1,139.59x = 1,160,203.90
  5. Step 5: Solve for x
    x = 1,160,203.90/1,139.59
  6. Step 6: Final answer
    x = 1,018.09

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.