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Finding the Fourth Proportional to 85,712.80, 128,569.20 and 39,056.80

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Solution

The fourth proportional to 85,712.80, 128,569.20 and 39,056.80 is: 58,585.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,712.80 : 128,569.20 = 39,056.80 : x
  2. Step 2: Convert to fraction form
    85,712.80/128,569.20 = 39,056.80/x
  3. Step 3: Cross multiply
    85,712.80x = 128,569.20 × 39,056.80
  4. Step 4: Simplify right side
    85,712.80x = 5,021,501,530.56
  5. Step 5: Solve for x
    x = 5,021,501,530.56/85,712.80
  6. Step 6: Final answer
    x = 58,585.20

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Similar ratio
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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.