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Finding the Fourth Proportional to 289,707.80, 434,561.70 and 261,714.20

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Solution

The fourth proportional to 289,707.80, 434,561.70 and 261,714.20 is: 392,571.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    289,707.80 : 434,561.70 = 261,714.20 : x
  2. Step 2: Convert to fraction form
    289,707.80/434,561.70 = 261,714.20/x
  3. Step 3: Cross multiply
    289,707.80x = 434,561.70 × 261,714.20
  4. Step 4: Simplify right side
    289,707.80x = 113,730,967,666.14
  5. Step 5: Solve for x
    x = 113,730,967,666.14/289,707.80
  6. Step 6: Final answer
    x = 392,571.30

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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.