Home / 90,837.80-136,256.70-68,719.40

Finding the Fourth Proportional to 90,837.80, 136,256.70 and 68,719.40

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Solution

The fourth proportional to 90,837.80, 136,256.70 and 68,719.40 is: 103,079.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    90,837.80 : 136,256.70 = 68,719.40 : x
  2. Step 2: Convert to fraction form
    90,837.80/136,256.70 = 68,719.40/x
  3. Step 3: Cross multiply
    90,837.80x = 136,256.70 × 68,719.40
  4. Step 4: Simplify right side
    90,837.80x = 9,363,478,669.98
  5. Step 5: Solve for x
    x = 9,363,478,669.98/90,837.80
  6. Step 6: Final answer
    x = 103,079.10

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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.