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Finding the Fourth Proportional to 84,124.80, 115,971.72 and 66,188.88

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Solution

The fourth proportional to 84,124.80, 115,971.72 and 66,188.88 is: 91,245.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,124.80 : 115,971.72 = 66,188.88 : x
  2. Step 2: Convert to fraction form
    84,124.80/115,971.72 = 66,188.88/x
  3. Step 3: Cross multiply
    84,124.80x = 115,971.72 × 66,188.88
  4. Step 4: Simplify right side
    84,124.80x = 7,676,038,258.47
  5. Step 5: Solve for x
    x = 7,676,038,258.47/84,124.80
  6. Step 6: Final answer
    x = 91,245.84

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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.