Home / 261,408.47-392,112.85-128,257.83

Finding the Fourth Proportional to 261,408.47, 392,112.85 and 128,257.83

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Solution

The fourth proportional to 261,408.47, 392,112.85 and 128,257.83 is: 192,386.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,408.47 : 392,112.85 = 128,257.83 : x
  2. Step 2: Convert to fraction form
    261,408.47/392,112.85 = 128,257.83/x
  3. Step 3: Cross multiply
    261,408.47x = 392,112.85 × 128,257.83
  4. Step 4: Simplify right side
    261,408.47x = 50,291,543,175.95
  5. Step 5: Solve for x
    x = 50,291,543,175.95/261,408.47
  6. Step 6: Final answer
    x = 192,386.82

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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.