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Finding the Fourth Proportional to 287,999.20, 431,653.20 and 147,685.60

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Solution

The fourth proportional to 287,999.20, 431,653.20 and 147,685.60 is: 221,351.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,999.20 : 431,653.20 = 147,685.60 : x
  2. Step 2: Convert to fraction form
    287,999.20/431,653.20 = 147,685.60/x
  3. Step 3: Cross multiply
    287,999.20x = 431,653.20 × 147,685.60
  4. Step 4: Simplify right side
    287,999.20x = 63,748,961,833.92
  5. Step 5: Solve for x
    x = 63,748,961,833.92/287,999.20
  6. Step 6: Final answer
    x = 221,351.18

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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.