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Finding the Fourth Proportional to 91,079.70, 135,703.81 and 85,986.72

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Solution

The fourth proportional to 91,079.70, 135,703.81 and 85,986.72 is: 128,115.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,079.70 : 135,703.81 = 85,986.72 : x
  2. Step 2: Convert to fraction form
    91,079.70/135,703.81 = 85,986.72/x
  3. Step 3: Cross multiply
    91,079.70x = 135,703.81 × 85,986.72
  4. Step 4: Simplify right side
    91,079.70x = 11,668,725,513.40
  5. Step 5: Solve for x
    x = 11,668,725,513.40/91,079.70
  6. Step 6: Final answer
    x = 128,115.55

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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.