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Finding the Fourth Proportional to 1,258.45, 1,885.85 and 554.81

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Solution

The fourth proportional to 1,258.45, 1,885.85 and 554.81 is: 831.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,258.45 : 1,885.85 = 554.81 : x
  2. Step 2: Convert to fraction form
    1,258.45/1,885.85 = 554.81/x
  3. Step 3: Cross multiply
    1,258.45x = 1,885.85 × 554.81
  4. Step 4: Simplify right side
    1,258.45x = 1,046,278.32
  5. Step 5: Solve for x
    x = 1,046,278.32/1,258.45
  6. Step 6: Final answer
    x = 831.40

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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.