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Finding the Fourth Proportional to 939.76, 1,406.52 and 572.74

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Solution

The fourth proportional to 939.76, 1,406.52 and 572.74 is: 857.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    939.76 : 1,406.52 = 572.74 : x
  2. Step 2: Convert to fraction form
    939.76/1,406.52 = 572.74/x
  3. Step 3: Cross multiply
    939.76x = 1,406.52 × 572.74
  4. Step 4: Simplify right side
    939.76x = 805,570.26
  5. Step 5: Solve for x
    x = 805,570.26/939.76
  6. Step 6: Final answer
    x = 857.21

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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.