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Finding the Fourth Proportional to 1,137.90, 1,710.90 and 959.70

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Solution

The fourth proportional to 1,137.90, 1,710.90 and 959.70 is: 1,442.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,137.90 : 1,710.90 = 959.70 : x
  2. Step 2: Convert to fraction form
    1,137.90/1,710.90 = 959.70/x
  3. Step 3: Cross multiply
    1,137.90x = 1,710.90 × 959.70
  4. Step 4: Simplify right side
    1,137.90x = 1,641,950.73
  5. Step 5: Solve for x
    x = 1,641,950.73/1,137.90
  6. Step 6: Final answer
    x = 1,442.97

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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.