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Finding the Fourth Proportional to 121,570.30, 182,355.45 and 86,140.90

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Solution

The fourth proportional to 121,570.30, 182,355.45 and 86,140.90 is: 129,211.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,570.30 : 182,355.45 = 86,140.90 : x
  2. Step 2: Convert to fraction form
    121,570.30/182,355.45 = 86,140.90/x
  3. Step 3: Cross multiply
    121,570.30x = 182,355.45 × 86,140.90
  4. Step 4: Simplify right side
    121,570.30x = 15,708,262,582.91
  5. Step 5: Solve for x
    x = 15,708,262,582.91/121,570.30
  6. Step 6: Final answer
    x = 129,211.35

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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.