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Finding the Fourth Proportional to 121,780.16, 168,055.92 and 68,065.08

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Solution

The fourth proportional to 121,780.16, 168,055.92 and 68,065.08 is: 93,929.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,780.16 : 168,055.92 = 68,065.08 : x
  2. Step 2: Convert to fraction form
    121,780.16/168,055.92 = 68,065.08/x
  3. Step 3: Cross multiply
    121,780.16x = 168,055.92 × 68,065.08
  4. Step 4: Simplify right side
    121,780.16x = 11,438,739,639.27
  5. Step 5: Solve for x
    x = 11,438,739,639.27/121,780.16
  6. Step 6: Final answer
    x = 93,929.42

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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.