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Finding the Fourth Proportional to 1,257.80, 1,886.90 and 435.87

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Solution

The fourth proportional to 1,257.80, 1,886.90 and 435.87 is: 653.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.80 : 1,886.90 = 435.87 : x
  2. Step 2: Convert to fraction form
    1,257.80/1,886.90 = 435.87/x
  3. Step 3: Cross multiply
    1,257.80x = 1,886.90 × 435.87
  4. Step 4: Simplify right side
    1,257.80x = 822,440.92
  5. Step 5: Solve for x
    x = 822,440.92/1,257.80
  6. Step 6: Final answer
    x = 653.88

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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.