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Finding the Fourth Proportional to 938.07, 1,406.94 and 288.63

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Solution

The fourth proportional to 938.07, 1,406.94 and 288.63 is: 432.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.07 : 1,406.94 = 288.63 : x
  2. Step 2: Convert to fraction form
    938.07/1,406.94 = 288.63/x
  3. Step 3: Cross multiply
    938.07x = 1,406.94 × 288.63
  4. Step 4: Simplify right side
    938.07x = 406,085.09
  5. Step 5: Solve for x
    x = 406,085.09/938.07
  6. Step 6: Final answer
    x = 432.89

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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.