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Finding the Fourth Proportional to 261,335.21, 391,908.70 and 90,510.67

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Solution

The fourth proportional to 261,335.21, 391,908.70 and 90,510.67 is: 135,733.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,335.21 : 391,908.70 = 90,510.67 : x
  2. Step 2: Convert to fraction form
    261,335.21/391,908.70 = 90,510.67/x
  3. Step 3: Cross multiply
    261,335.21x = 391,908.70 × 90,510.67
  4. Step 4: Simplify right side
    261,335.21x = 35,471,916,603.73
  5. Step 5: Solve for x
    x = 35,471,916,603.73/261,335.21
  6. Step 6: Final answer
    x = 135,733.40

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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.