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Finding the Fourth Proportional to 91,215.60, 136,823.40 and 87,716.40

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Solution

The fourth proportional to 91,215.60, 136,823.40 and 87,716.40 is: 131,574.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,215.60 : 136,823.40 = 87,716.40 : x
  2. Step 2: Convert to fraction form
    91,215.60/136,823.40 = 87,716.40/x
  3. Step 3: Cross multiply
    91,215.60x = 136,823.40 × 87,716.40
  4. Step 4: Simplify right side
    91,215.60x = 12,001,656,083.76
  5. Step 5: Solve for x
    x = 12,001,656,083.76/91,215.60
  6. Step 6: Final answer
    x = 131,574.60

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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.