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Finding the Fourth Proportional to 261,037.20, 391,037.40 and 155,542.80

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Solution

The fourth proportional to 261,037.20, 391,037.40 and 155,542.80 is: 233,005.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,037.20 : 391,037.40 = 155,542.80 : x
  2. Step 2: Convert to fraction form
    261,037.20/391,037.40 = 155,542.80/x
  3. Step 3: Cross multiply
    261,037.20x = 391,037.40 × 155,542.80
  4. Step 4: Simplify right side
    261,037.20x = 60,823,052,100.72
  5. Step 5: Solve for x
    x = 60,823,052,100.72/261,037.20
  6. Step 6: Final answer
    x = 233,005.30

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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.