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Finding the Fourth Proportional to 91,469.40, 137,495.70 and 86,220.60

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Solution

The fourth proportional to 91,469.40, 137,495.70 and 86,220.60 is: 129,605.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,469.40 : 137,495.70 = 86,220.60 : x
  2. Step 2: Convert to fraction form
    91,469.40/137,495.70 = 86,220.60/x
  3. Step 3: Cross multiply
    91,469.40x = 137,495.70 × 86,220.60
  4. Step 4: Simplify right side
    91,469.40x = 11,854,961,751.42
  5. Step 5: Solve for x
    x = 11,854,961,751.42/91,469.40
  6. Step 6: Final answer
    x = 129,605.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.