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Finding the Fourth Proportional to 121,868, 168,197.40 and 71,557.28

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Solution

The fourth proportional to 121,868, 168,197.40 and 71,557.28 is: 98,760.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,868 : 168,197.40 = 71,557.28 : x
  2. Step 2: Convert to fraction form
    121,868/168,197.40 = 71,557.28/x
  3. Step 3: Cross multiply
    121,868x = 168,197.40 × 71,557.28
  4. Step 4: Simplify right side
    121,868x = 12,035,748,447.07
  5. Step 5: Solve for x
    x = 12,035,748,447.07/121,868
  6. Step 6: Final answer
    x = 98,760.53

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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.