Home / 91,289.40-136,934.10-81,612.60

Finding the Fourth Proportional to 91,289.40, 136,934.10 and 81,612.60

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Solution

The fourth proportional to 91,289.40, 136,934.10 and 81,612.60 is: 122,418.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    91,289.40 : 136,934.10 = 81,612.60 : x
  2. Step 2: Convert to fraction form
    91,289.40/136,934.10 = 81,612.60/x
  3. Step 3: Cross multiply
    91,289.40x = 136,934.10 × 81,612.60
  4. Step 4: Simplify right side
    91,289.40x = 11,175,547,929.66
  5. Step 5: Solve for x
    x = 11,175,547,929.66/91,289.40
  6. Step 6: Final answer
    x = 122,418.90

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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.