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Finding the Fourth Proportional to 1,503.60, 2,255.40 and 408.10

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Solution

The fourth proportional to 1,503.60, 2,255.40 and 408.10 is: 612.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,503.60 : 2,255.40 = 408.10 : x
  2. Step 2: Convert to fraction form
    1,503.60/2,255.40 = 408.10/x
  3. Step 3: Cross multiply
    1,503.60x = 2,255.40 × 408.10
  4. Step 4: Simplify right side
    1,503.60x = 920,428.74
  5. Step 5: Solve for x
    x = 920,428.74/1,503.60
  6. Step 6: Final answer
    x = 612.15

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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.