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Finding the Fourth Proportional to 1,256.43, 1,884.66 and 390.75

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Solution

The fourth proportional to 1,256.43, 1,884.66 and 390.75 is: 586.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,256.43 : 1,884.66 = 390.75 : x
  2. Step 2: Convert to fraction form
    1,256.43/1,884.66 = 390.75/x
  3. Step 3: Cross multiply
    1,256.43x = 1,884.66 × 390.75
  4. Step 4: Simplify right side
    1,256.43x = 736,430.90
  5. Step 5: Solve for x
    x = 736,430.90/1,256.43
  6. Step 6: Final answer
    x = 586.13

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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.