Home / 121,817.10-168,159.42-74,085.78

Finding the Fourth Proportional to 121,817.10, 168,159.42 and 74,085.78

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Solution

The fourth proportional to 121,817.10, 168,159.42 and 74,085.78 is: 102,269.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    121,817.10 : 168,159.42 = 74,085.78 : x
  2. Step 2: Convert to fraction form
    121,817.10/168,159.42 = 74,085.78/x
  3. Step 3: Cross multiply
    121,817.10x = 168,159.42 × 74,085.78
  4. Step 4: Simplify right side
    121,817.10x = 12,458,221,795.05
  5. Step 5: Solve for x
    x = 12,458,221,795.05/121,817.10
  6. Step 6: Final answer
    x = 102,269.89

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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.