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Finding the Fourth Proportional to 121,987.60, 182,981.40 and 47,111.20

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Solution

The fourth proportional to 121,987.60, 182,981.40 and 47,111.20 is: 70,666.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,987.60 : 182,981.40 = 47,111.20 : x
  2. Step 2: Convert to fraction form
    121,987.60/182,981.40 = 47,111.20/x
  3. Step 3: Cross multiply
    121,987.60x = 182,981.40 × 47,111.20
  4. Step 4: Simplify right side
    121,987.60x = 8,620,473,331.68
  5. Step 5: Solve for x
    x = 8,620,473,331.68/121,987.60
  6. Step 6: Final answer
    x = 70,666.80

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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.