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Finding the Fourth Proportional to 84,100.86, 115,938.62 and 66,164.76

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Solution

The fourth proportional to 84,100.86, 115,938.62 and 66,164.76 is: 91,212.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,100.86 : 115,938.62 = 66,164.76 : x
  2. Step 2: Convert to fraction form
    84,100.86/115,938.62 = 66,164.76/x
  3. Step 3: Cross multiply
    84,100.86x = 115,938.62 × 66,164.76
  4. Step 4: Simplify right side
    84,100.86x = 7,671,050,967.03
  5. Step 5: Solve for x
    x = 7,671,050,967.03/84,100.86
  6. Step 6: Final answer
    x = 91,212.52

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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.