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Finding the Fourth Proportional to 287,400.20, 431,100.30 and 187,867.40

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Solution

The fourth proportional to 287,400.20, 431,100.30 and 187,867.40 is: 281,801.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,400.20 : 431,100.30 = 187,867.40 : x
  2. Step 2: Convert to fraction form
    287,400.20/431,100.30 = 187,867.40/x
  3. Step 3: Cross multiply
    287,400.20x = 431,100.30 × 187,867.40
  4. Step 4: Simplify right side
    287,400.20x = 80,989,692,500.22
  5. Step 5: Solve for x
    x = 80,989,692,500.22/287,400.20
  6. Step 6: Final answer
    x = 281,801.10

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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.