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Finding the Fourth Proportional to 936.05, 1,403.04 and 387.93

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Solution

The fourth proportional to 936.05, 1,403.04 and 387.93 is: 581.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.05 : 1,403.04 = 387.93 : x
  2. Step 2: Convert to fraction form
    936.05/1,403.04 = 387.93/x
  3. Step 3: Cross multiply
    936.05x = 1,403.04 × 387.93
  4. Step 4: Simplify right side
    936.05x = 544,281.31
  5. Step 5: Solve for x
    x = 544,281.31/936.05
  6. Step 6: Final answer
    x = 581.47

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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.