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Finding the Fourth Proportional to 85,907.28, 128,809.13 and 38,513.80

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Solution

The fourth proportional to 85,907.28, 128,809.13 and 38,513.80 is: 57,747.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,907.28 : 128,809.13 = 38,513.80 : x
  2. Step 2: Convert to fraction form
    85,907.28/128,809.13 = 38,513.80/x
  3. Step 3: Cross multiply
    85,907.28x = 128,809.13 × 38,513.80
  4. Step 4: Simplify right side
    85,907.28x = 4,960,928,878.43
  5. Step 5: Solve for x
    x = 4,960,928,878.43/85,907.28
  6. Step 6: Final answer
    x = 57,747.48

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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.