Home / 1,258.12-1,886.42-517.15

Finding the Fourth Proportional to 1,258.12, 1,886.42 and 517.15

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Solution

The fourth proportional to 1,258.12, 1,886.42 and 517.15 is: 775.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.12 : 1,886.42 = 517.15 : x
  2. Step 2: Convert to fraction form
    1,258.12/1,886.42 = 517.15/x
  3. Step 3: Cross multiply
    1,258.12x = 1,886.42 × 517.15
  4. Step 4: Simplify right side
    1,258.12x = 975,565.75
  5. Step 5: Solve for x
    x = 975,565.75/1,258.12
  6. Step 6: Final answer
    x = 775.42

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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.