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Finding the Fourth Proportional to 898.45, 1,348.12 and 405.20

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Solution

The fourth proportional to 898.45, 1,348.12 and 405.20 is: 608.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    898.45 : 1,348.12 = 405.20 : x
  2. Step 2: Convert to fraction form
    898.45/1,348.12 = 405.20/x
  3. Step 3: Cross multiply
    898.45x = 1,348.12 × 405.20
  4. Step 4: Simplify right side
    898.45x = 546,257.05
  5. Step 5: Solve for x
    x = 546,257.05/898.45
  6. Step 6: Final answer
    x = 608.00

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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.