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Finding the Fourth Proportional to 121,881.28, 168,165.84 and 76,566.64

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Solution

The fourth proportional to 121,881.28, 168,165.84 and 76,566.64 is: 105,642.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,881.28 : 168,165.84 = 76,566.64 : x
  2. Step 2: Convert to fraction form
    121,881.28/168,165.84 = 76,566.64/x
  3. Step 3: Cross multiply
    121,881.28x = 168,165.84 × 76,566.64
  4. Step 4: Simplify right side
    121,881.28x = 12,875,893,331.58
  5. Step 5: Solve for x
    x = 12,875,893,331.58/121,881.28
  6. Step 6: Final answer
    x = 105,642.91

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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.