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Finding the Fourth Proportional to 1,057.45, 1,586.27 and 390.53

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Solution

The fourth proportional to 1,057.45, 1,586.27 and 390.53 is: 585.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,057.45 : 1,586.27 = 390.53 : x
  2. Step 2: Convert to fraction form
    1,057.45/1,586.27 = 390.53/x
  3. Step 3: Cross multiply
    1,057.45x = 1,586.27 × 390.53
  4. Step 4: Simplify right side
    1,057.45x = 619,488.04
  5. Step 5: Solve for x
    x = 619,488.04/1,057.45
  6. Step 6: Final answer
    x = 585.83

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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.