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Finding the Fourth Proportional to 1,257.35, 1,886.40 and 997.45

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Solution

The fourth proportional to 1,257.35, 1,886.40 and 997.45 is: 1,496.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,257.35 : 1,886.40 = 997.45 : x
  2. Step 2: Convert to fraction form
    1,257.35/1,886.40 = 997.45/x
  3. Step 3: Cross multiply
    1,257.35x = 1,886.40 × 997.45
  4. Step 4: Simplify right side
    1,257.35x = 1,881,584.96
  5. Step 5: Solve for x
    x = 1,881,584.96/1,257.35
  6. Step 6: Final answer
    x = 1,496.47

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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.