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Finding the Fourth Proportional to 287,799.20, 431,698.80 and 188,266.40

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Solution

The fourth proportional to 287,799.20, 431,698.80 and 188,266.40 is: 282,399.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,799.20 : 431,698.80 = 188,266.40 : x
  2. Step 2: Convert to fraction form
    287,799.20/431,698.80 = 188,266.40/x
  3. Step 3: Cross multiply
    287,799.20x = 431,698.80 × 188,266.40
  4. Step 4: Simplify right side
    287,799.20x = 81,274,378,960.32
  5. Step 5: Solve for x
    x = 81,274,378,960.32/287,799.20
  6. Step 6: Final answer
    x = 282,399.60

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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.