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Finding the Fourth Proportional to 85,809.92, 128,678.40 and 39,092.48

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Solution

The fourth proportional to 85,809.92, 128,678.40 and 39,092.48 is: 58,622.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,809.92 : 128,678.40 = 39,092.48 : x
  2. Step 2: Convert to fraction form
    85,809.92/128,678.40 = 39,092.48/x
  3. Step 3: Cross multiply
    85,809.92x = 128,678.40 × 39,092.48
  4. Step 4: Simplify right side
    85,809.92x = 5,030,357,778.43
  5. Step 5: Solve for x
    x = 5,030,357,778.43/85,809.92
  6. Step 6: Final answer
    x = 58,622.10

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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.