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Finding the Fourth Proportional to 91,071.42, 135,894.79 and 81,615.06

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Solution

The fourth proportional to 91,071.42, 135,894.79 and 81,615.06 is: 121,784.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,071.42 : 135,894.79 = 81,615.06 : x
  2. Step 2: Convert to fraction form
    91,071.42/135,894.79 = 81,615.06/x
  3. Step 3: Cross multiply
    91,071.42x = 135,894.79 × 81,615.06
  4. Step 4: Simplify right side
    91,071.42x = 11,091,061,439.54
  5. Step 5: Solve for x
    x = 11,091,061,439.54/91,071.42
  6. Step 6: Final answer
    x = 121,784.22

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.