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Finding the Fourth Proportional to 1,258.47, 1,887.91 and 392.78

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Solution

The fourth proportional to 1,258.47, 1,887.91 and 392.78 is: 589.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.47 : 1,887.91 = 392.78 : x
  2. Step 2: Convert to fraction form
    1,258.47/1,887.91 = 392.78/x
  3. Step 3: Cross multiply
    1,258.47x = 1,887.91 × 392.78
  4. Step 4: Simplify right side
    1,258.47x = 741,537.03
  5. Step 5: Solve for x
    x = 741,537.03/1,258.47
  6. Step 6: Final answer
    x = 589.24

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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.