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Finding the Fourth Proportional to 287,440.20, 431,354.70 and 161,080.20

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Solution

The fourth proportional to 287,440.20, 431,354.70 and 161,080.20 is: 241,729.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,440.20 : 431,354.70 = 161,080.20 : x
  2. Step 2: Convert to fraction form
    287,440.20/431,354.70 = 161,080.20/x
  3. Step 3: Cross multiply
    287,440.20x = 431,354.70 × 161,080.20
  4. Step 4: Simplify right side
    287,440.20x = 69,482,701,346.94
  5. Step 5: Solve for x
    x = 69,482,701,346.94/287,440.20
  6. Step 6: Final answer
    x = 241,729.24

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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.