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Finding the Fourth Proportional to 938.36, 1,406.66 and 438.01

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Solution

The fourth proportional to 938.36, 1,406.66 and 438.01 is: 656.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.36 : 1,406.66 = 438.01 : x
  2. Step 2: Convert to fraction form
    938.36/1,406.66 = 438.01/x
  3. Step 3: Cross multiply
    938.36x = 1,406.66 × 438.01
  4. Step 4: Simplify right side
    938.36x = 616,125.21
  5. Step 5: Solve for x
    x = 616,125.21/938.36
  6. Step 6: Final answer
    x = 656.60

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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.