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Finding the Fourth Proportional to 1,585.55, 2,378.33 and 431.30

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Solution

The fourth proportional to 1,585.55, 2,378.33 and 431.30 is: 646.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,585.55 : 2,378.33 = 431.30 : x
  2. Step 2: Convert to fraction form
    1,585.55/2,378.33 = 431.30/x
  3. Step 3: Cross multiply
    1,585.55x = 2,378.33 × 431.30
  4. Step 4: Simplify right side
    1,585.55x = 1,025,765.76
  5. Step 5: Solve for x
    x = 1,025,765.76/1,585.55
  6. Step 6: Final answer
    x = 646.95

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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.