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Finding the Fourth Proportional to 121,649.64, 167,869.53 and 72,646.56

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Solution

The fourth proportional to 121,649.64, 167,869.53 and 72,646.56 is: 100,248.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,649.64 : 167,869.53 = 72,646.56 : x
  2. Step 2: Convert to fraction form
    121,649.64/167,869.53 = 72,646.56/x
  3. Step 3: Cross multiply
    121,649.64x = 167,869.53 × 72,646.56
  4. Step 4: Simplify right side
    121,649.64x = 12,195,143,883.32
  5. Step 5: Solve for x
    x = 12,195,143,883.32/121,649.64
  6. Step 6: Final answer
    x = 100,248.09

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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.