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Finding the Fourth Proportional to 261,047.70, 391,571.89 and 71,509.74

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Solution

The fourth proportional to 261,047.70, 391,571.89 and 71,509.74 is: 107,264.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,047.70 : 391,571.89 = 71,509.74 : x
  2. Step 2: Convert to fraction form
    261,047.70/391,571.89 = 71,509.74/x
  3. Step 3: Cross multiply
    261,047.70x = 391,571.89 × 71,509.74
  4. Step 4: Simplify right side
    261,047.70x = 28,001,202,599.16
  5. Step 5: Solve for x
    x = 28,001,202,599.16/261,047.70
  6. Step 6: Final answer
    x = 107,264.70

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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.