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Finding the Fourth Proportional to 121,987.80, 182,981.70 and 86,558.40

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Solution

The fourth proportional to 121,987.80, 182,981.70 and 86,558.40 is: 129,837.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,987.80 : 182,981.70 = 86,558.40 : x
  2. Step 2: Convert to fraction form
    121,987.80/182,981.70 = 86,558.40/x
  3. Step 3: Cross multiply
    121,987.80x = 182,981.70 × 86,558.40
  4. Step 4: Simplify right side
    121,987.80x = 15,838,603,181.28
  5. Step 5: Solve for x
    x = 15,838,603,181.28/121,987.80
  6. Step 6: Final answer
    x = 129,837.60

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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.