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Finding the Fourth Proportional to 1,117.95, 1,545.74 and 979.57

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Solution

The fourth proportional to 1,117.95, 1,545.74 and 979.57 is: 1,354.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,117.95 : 1,545.74 = 979.57 : x
  2. Step 2: Convert to fraction form
    1,117.95/1,545.74 = 979.57/x
  3. Step 3: Cross multiply
    1,117.95x = 1,545.74 × 979.57
  4. Step 4: Simplify right side
    1,117.95x = 1,514,160.53
  5. Step 5: Solve for x
    x = 1,514,160.53/1,117.95
  6. Step 6: Final answer
    x = 1,354.41

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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.