Home / 102,691.20-154,036.80-90,638.40

Finding the Fourth Proportional to 102,691.20, 154,036.80 and 90,638.40

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Solution

The fourth proportional to 102,691.20, 154,036.80 and 90,638.40 is: 135,957.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    102,691.20 : 154,036.80 = 90,638.40 : x
  2. Step 2: Convert to fraction form
    102,691.20/154,036.80 = 90,638.40/x
  3. Step 3: Cross multiply
    102,691.20x = 154,036.80 × 90,638.40
  4. Step 4: Simplify right side
    102,691.20x = 13,961,649,093.12
  5. Step 5: Solve for x
    x = 13,961,649,093.12/102,691.20
  6. Step 6: Final answer
    x = 135,957.60

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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.