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Finding the Fourth Proportional to 1,124.51, 1,685.95 and 393.89

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Solution

The fourth proportional to 1,124.51, 1,685.95 and 393.89 is: 590.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,124.51 : 1,685.95 = 393.89 : x
  2. Step 2: Convert to fraction form
    1,124.51/1,685.95 = 393.89/x
  3. Step 3: Cross multiply
    1,124.51x = 1,685.95 × 393.89
  4. Step 4: Simplify right side
    1,124.51x = 664,069.43
  5. Step 5: Solve for x
    x = 664,069.43/1,124.51
  6. Step 6: Final answer
    x = 590.54

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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.