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Finding the Fourth Proportional to 1,057.80, 1,587.30 and 408.58

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Solution

The fourth proportional to 1,057.80, 1,587.30 and 408.58 is: 613.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.80 : 1,587.30 = 408.58 : x
  2. Step 2: Convert to fraction form
    1,057.80/1,587.30 = 408.58/x
  3. Step 3: Cross multiply
    1,057.80x = 1,587.30 × 408.58
  4. Step 4: Simplify right side
    1,057.80x = 648,539.03
  5. Step 5: Solve for x
    x = 648,539.03/1,057.80
  6. Step 6: Final answer
    x = 613.10

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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.