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Finding the Fourth Proportional to 91,390.60, 137,085.90 and 87,891.40

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Solution

The fourth proportional to 91,390.60, 137,085.90 and 87,891.40 is: 131,837.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,390.60 : 137,085.90 = 87,891.40 : x
  2. Step 2: Convert to fraction form
    91,390.60/137,085.90 = 87,891.40/x
  3. Step 3: Cross multiply
    91,390.60x = 137,085.90 × 87,891.40
  4. Step 4: Simplify right side
    91,390.60x = 12,048,671,671.26
  5. Step 5: Solve for x
    x = 12,048,671,671.26/91,390.60
  6. Step 6: Final answer
    x = 131,837.10

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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.