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Finding the Fourth Proportional to 261,337.21, 391,911.69 and 90,512.67

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Solution

The fourth proportional to 261,337.21, 391,911.69 and 90,512.67 is: 135,736.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,337.21 : 391,911.69 = 90,512.67 : x
  2. Step 2: Convert to fraction form
    261,337.21/391,911.69 = 90,512.67/x
  3. Step 3: Cross multiply
    261,337.21x = 391,911.69 × 90,512.67
  4. Step 4: Simplify right side
    261,337.21x = 35,472,973,466.11
  5. Step 5: Solve for x
    x = 35,472,973,466.11/261,337.21
  6. Step 6: Final answer
    x = 135,736.41

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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.