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Finding the Fourth Proportional to 1,256.57, 1,884.78 and 390.86

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Solution

The fourth proportional to 1,256.57, 1,884.78 and 390.86 is: 586.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.57 : 1,884.78 = 390.86 : x
  2. Step 2: Convert to fraction form
    1,256.57/1,884.78 = 390.86/x
  3. Step 3: Cross multiply
    1,256.57x = 1,884.78 × 390.86
  4. Step 4: Simplify right side
    1,256.57x = 736,685.11
  5. Step 5: Solve for x
    x = 736,685.11/1,256.57
  6. Step 6: Final answer
    x = 586.27

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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.