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Finding the Fourth Proportional to 287,687.40, 397,178.72 and 255,767.98

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Solution

The fourth proportional to 287,687.40, 397,178.72 and 255,767.98 is: 353,111.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,687.40 : 397,178.72 = 255,767.98 : x
  2. Step 2: Convert to fraction form
    287,687.40/397,178.72 = 255,767.98/x
  3. Step 3: Cross multiply
    287,687.40x = 397,178.72 × 255,767.98
  4. Step 4: Simplify right side
    287,687.40x = 101,585,597,626.09
  5. Step 5: Solve for x
    x = 101,585,597,626.09/287,687.40
  6. Step 6: Final answer
    x = 353,111.05

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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.