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Finding the Fourth Proportional to 105,290.38, 158,645.95 and 86,980.60

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Solution

The fourth proportional to 105,290.38, 158,645.95 and 86,980.60 is: 131,057.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    105,290.38 : 158,645.95 = 86,980.60 : x
  2. Step 2: Convert to fraction form
    105,290.38/158,645.95 = 86,980.60/x
  3. Step 3: Cross multiply
    105,290.38x = 158,645.95 × 86,980.60
  4. Step 4: Simplify right side
    105,290.38x = 13,799,119,918.57
  5. Step 5: Solve for x
    x = 13,799,119,918.57/105,290.38
  6. Step 6: Final answer
    x = 131,057.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.