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Finding the Fourth Proportional to 1,258.74, 1,888.28 and 425.96

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Solution

The fourth proportional to 1,258.74, 1,888.28 and 425.96 is: 639.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.74 : 1,888.28 = 425.96 : x
  2. Step 2: Convert to fraction form
    1,258.74/1,888.28 = 425.96/x
  3. Step 3: Cross multiply
    1,258.74x = 1,888.28 × 425.96
  4. Step 4: Simplify right side
    1,258.74x = 804,331.75
  5. Step 5: Solve for x
    x = 804,331.75/1,258.74
  6. Step 6: Final answer
    x = 639.00

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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.