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Finding the Fourth Proportional to 938.64, 1,406.90 and 572.62

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Solution

The fourth proportional to 938.64, 1,406.90 and 572.62 is: 858.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    938.64 : 1,406.90 = 572.62 : x
  2. Step 2: Convert to fraction form
    938.64/1,406.90 = 572.62/x
  3. Step 3: Cross multiply
    938.64x = 1,406.90 × 572.62
  4. Step 4: Simplify right side
    938.64x = 805,619.08
  5. Step 5: Solve for x
    x = 805,619.08/938.64
  6. Step 6: Final answer
    x = 858.28

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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.