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Finding the Fourth Proportional to 841.20, 1,258.50 and 553.20

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Solution

The fourth proportional to 841.20, 1,258.50 and 553.20 is: 827.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    841.20 : 1,258.50 = 553.20 : x
  2. Step 2: Convert to fraction form
    841.20/1,258.50 = 553.20/x
  3. Step 3: Cross multiply
    841.20x = 1,258.50 × 553.20
  4. Step 4: Simplify right side
    841.20x = 696,202.20
  5. Step 5: Solve for x
    x = 696,202.20/841.20
  6. Step 6: Final answer
    x = 827.63

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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.