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Finding the Fourth Proportional to 90,659.88, 125,009.74 and 61,984.20

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Solution

The fourth proportional to 90,659.88, 125,009.74 and 61,984.20 is: 85,469.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,659.88 : 125,009.74 = 61,984.20 : x
  2. Step 2: Convert to fraction form
    90,659.88/125,009.74 = 61,984.20/x
  3. Step 3: Cross multiply
    90,659.88x = 125,009.74 × 61,984.20
  4. Step 4: Simplify right side
    90,659.88x = 7,748,628,726.11
  5. Step 5: Solve for x
    x = 7,748,628,726.11/90,659.88
  6. Step 6: Final answer
    x = 85,469.21

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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.