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Finding the Fourth Proportional to 81,719.97, 112,763.25 and 47,720.49

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Solution

The fourth proportional to 81,719.97, 112,763.25 and 47,720.49 is: 65,848.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,719.97 : 112,763.25 = 47,720.49 : x
  2. Step 2: Convert to fraction form
    81,719.97/112,763.25 = 47,720.49/x
  3. Step 3: Cross multiply
    81,719.97x = 112,763.25 × 47,720.49
  4. Step 4: Simplify right side
    81,719.97x = 5,381,117,543.99
  5. Step 5: Solve for x
    x = 5,381,117,543.99/81,719.97
  6. Step 6: Final answer
    x = 65,848.26

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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.