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Finding the Fourth Proportional to 81,390.78, 112,328.55 and 49,578.30

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Solution

The fourth proportional to 81,390.78, 112,328.55 and 49,578.30 is: 68,423.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,390.78 : 112,328.55 = 49,578.30 : x
  2. Step 2: Convert to fraction form
    81,390.78/112,328.55 = 49,578.30/x
  3. Step 3: Cross multiply
    81,390.78x = 112,328.55 × 49,578.30
  4. Step 4: Simplify right side
    81,390.78x = 5,569,058,550.47
  5. Step 5: Solve for x
    x = 5,569,058,550.47/81,390.78
  6. Step 6: Final answer
    x = 68,423.70

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1.5x scale

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.