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Finding the Fourth Proportional to 287,436.80, 431,155.20 and 154,265.60

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Solution

The fourth proportional to 287,436.80, 431,155.20 and 154,265.60 is: 231,398.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,436.80 : 431,155.20 = 154,265.60 : x
  2. Step 2: Convert to fraction form
    287,436.80/431,155.20 = 154,265.60/x
  3. Step 3: Cross multiply
    287,436.80x = 431,155.20 × 154,265.60
  4. Step 4: Simplify right side
    287,436.80x = 66,512,415,621.12
  5. Step 5: Solve for x
    x = 66,512,415,621.12/287,436.80
  6. Step 6: Final answer
    x = 231,398.40

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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.