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Finding the Fourth Proportional to 85,790.32, 128,697.84 and 26,630.72

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Solution

The fourth proportional to 85,790.32, 128,697.84 and 26,630.72 is: 39,949.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,790.32 : 128,697.84 = 26,630.72 : x
  2. Step 2: Convert to fraction form
    85,790.32/128,697.84 = 26,630.72/x
  3. Step 3: Cross multiply
    85,790.32x = 128,697.84 × 26,630.72
  4. Step 4: Simplify right side
    85,790.32x = 3,427,316,141.64
  5. Step 5: Solve for x
    x = 3,427,316,141.64/85,790.32
  6. Step 6: Final answer
    x = 39,949.92

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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.