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Finding the Fourth Proportional to 121,407.80, 182,111.70 and 85,978.40

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Solution

The fourth proportional to 121,407.80, 182,111.70 and 85,978.40 is: 128,967.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,407.80 : 182,111.70 = 85,978.40 : x
  2. Step 2: Convert to fraction form
    121,407.80/182,111.70 = 85,978.40/x
  3. Step 3: Cross multiply
    121,407.80x = 182,111.70 × 85,978.40
  4. Step 4: Simplify right side
    121,407.80x = 15,657,672,587.28
  5. Step 5: Solve for x
    x = 15,657,672,587.28/121,407.80
  6. Step 6: Final answer
    x = 128,967.60

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.