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Finding the Fourth Proportional to 85,148.80, 128,360.88 and 79,439.92

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Solution

The fourth proportional to 85,148.80, 128,360.88 and 79,439.92 is: 119,754.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,148.80 : 128,360.88 = 79,439.92 : x
  2. Step 2: Convert to fraction form
    85,148.80/128,360.88 = 79,439.92/x
  3. Step 3: Cross multiply
    85,148.80x = 128,360.88 × 79,439.92
  4. Step 4: Simplify right side
    85,148.80x = 10,196,978,038.33
  5. Step 5: Solve for x
    x = 10,196,978,038.33/85,148.80
  6. Step 6: Final answer
    x = 119,754.81

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.