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Finding the Fourth Proportional to 261,707.70, 392,561.55 and 209,219.70

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Solution

The fourth proportional to 261,707.70, 392,561.55 and 209,219.70 is: 313,829.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    261,707.70 : 392,561.55 = 209,219.70 : x
  2. Step 2: Convert to fraction form
    261,707.70/392,561.55 = 209,219.70/x
  3. Step 3: Cross multiply
    261,707.70x = 392,561.55 × 209,219.70
  4. Step 4: Simplify right side
    261,707.70x = 82,131,609,722.54
  5. Step 5: Solve for x
    x = 82,131,609,722.54/261,707.70
  6. Step 6: Final answer
    x = 313,829.55

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Similar ratio
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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.