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Finding the Fourth Proportional to 121,873.40, 168,257.96 and 76,589.72

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Solution

The fourth proportional to 121,873.40, 168,257.96 and 76,589.72 is: 105,739.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,873.40 : 168,257.96 = 76,589.72 : x
  2. Step 2: Convert to fraction form
    121,873.40/168,257.96 = 76,589.72/x
  3. Step 3: Cross multiply
    121,873.40x = 168,257.96 × 76,589.72
  4. Step 4: Simplify right side
    121,873.40x = 12,886,830,044.17
  5. Step 5: Solve for x
    x = 12,886,830,044.17/121,873.40
  6. Step 6: Final answer
    x = 105,739.48

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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.