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Finding the Fourth Proportional to 261,408.97, 392,113.60 and 128,258.33

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Solution

The fourth proportional to 261,408.97, 392,113.60 and 128,258.33 is: 192,387.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,408.97 : 392,113.60 = 128,258.33 : x
  2. Step 2: Convert to fraction form
    261,408.97/392,113.60 = 128,258.33/x
  3. Step 3: Cross multiply
    261,408.97x = 392,113.60 × 128,258.33
  4. Step 4: Simplify right side
    261,408.97x = 50,291,835,506.29
  5. Step 5: Solve for x
    x = 50,291,835,506.29/261,408.97
  6. Step 6: Final answer
    x = 192,387.57

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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.