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Finding the Fourth Proportional to 287,364.20, 396,574.90 and 160,039.80

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Solution

The fourth proportional to 287,364.20, 396,574.90 and 160,039.80 is: 220,861.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,364.20 : 396,574.90 = 160,039.80 : x
  2. Step 2: Convert to fraction form
    287,364.20/396,574.90 = 160,039.80/x
  3. Step 3: Cross multiply
    287,364.20x = 396,574.90 × 160,039.80
  4. Step 4: Simplify right side
    287,364.20x = 63,467,767,681.02
  5. Step 5: Solve for x
    x = 63,467,767,681.02/287,364.20
  6. Step 6: Final answer
    x = 220,861.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.