Home / 121,865.40-168,246.90-76,581.72

Finding the Fourth Proportional to 121,865.40, 168,246.90 and 76,581.72

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Solution

The fourth proportional to 121,865.40, 168,246.90 and 76,581.72 is: 105,728.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,865.40 : 168,246.90 = 76,581.72 : x
  2. Step 2: Convert to fraction form
    121,865.40/168,246.90 = 76,581.72/x
  3. Step 3: Cross multiply
    121,865.40x = 168,246.90 × 76,581.72
  4. Step 4: Simplify right side
    121,865.40x = 12,884,636,986.67
  5. Step 5: Solve for x
    x = 12,884,636,986.67/121,865.40
  6. Step 6: Final answer
    x = 105,728.43

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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.