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Finding the Fourth Proportional to 85,641.48, 128,609.22 and 52,555.80

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Solution

The fourth proportional to 85,641.48, 128,609.22 and 52,555.80 is: 78,923.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,641.48 : 128,609.22 = 52,555.80 : x
  2. Step 2: Convert to fraction form
    85,641.48/128,609.22 = 52,555.80/x
  3. Step 3: Cross multiply
    85,641.48x = 128,609.22 × 52,555.80
  4. Step 4: Simplify right side
    85,641.48x = 6,759,160,444.48
  5. Step 5: Solve for x
    x = 6,759,160,444.48/85,641.48
  6. Step 6: Final answer
    x = 78,923.91

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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.