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Finding the Fourth Proportional to 85,815.10, 128,722.65 and 74,005.30

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Solution

The fourth proportional to 85,815.10, 128,722.65 and 74,005.30 is: 111,007.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,815.10 : 128,722.65 = 74,005.30 : x
  2. Step 2: Convert to fraction form
    85,815.10/128,722.65 = 74,005.30/x
  3. Step 3: Cross multiply
    85,815.10x = 128,722.65 × 74,005.30
  4. Step 4: Simplify right side
    85,815.10x = 9,526,158,330.05
  5. Step 5: Solve for x
    x = 9,526,158,330.05/85,815.10
  6. Step 6: Final answer
    x = 111,007.95

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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.