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Finding the Fourth Proportional to 287,751.20, 431,626.80 and 188,218.40

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Solution

The fourth proportional to 287,751.20, 431,626.80 and 188,218.40 is: 282,327.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,751.20 : 431,626.80 = 188,218.40 : x
  2. Step 2: Convert to fraction form
    287,751.20/431,626.80 = 188,218.40/x
  3. Step 3: Cross multiply
    287,751.20x = 431,626.80 × 188,218.40
  4. Step 4: Simplify right side
    287,751.20x = 81,240,105,693.12
  5. Step 5: Solve for x
    x = 81,240,105,693.12/287,751.20
  6. Step 6: Final answer
    x = 282,327.60

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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.