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Finding the Fourth Proportional to 1,250.42, 1,875.91 and 428.64

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Solution

The fourth proportional to 1,250.42, 1,875.91 and 428.64 is: 643.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,250.42 : 1,875.91 = 428.64 : x
  2. Step 2: Convert to fraction form
    1,250.42/1,875.91 = 428.64/x
  3. Step 3: Cross multiply
    1,250.42x = 1,875.91 × 428.64
  4. Step 4: Simplify right side
    1,250.42x = 804,086.65
  5. Step 5: Solve for x
    x = 804,086.65/1,250.42
  6. Step 6: Final answer
    x = 643.06

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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.