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Finding the Fourth Proportional to 921.60, 1,271.16 and 572.40

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Solution

The fourth proportional to 921.60, 1,271.16 and 572.40 is: 789.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.60 : 1,271.16 = 572.40 : x
  2. Step 2: Convert to fraction form
    921.60/1,271.16 = 572.40/x
  3. Step 3: Cross multiply
    921.60x = 1,271.16 × 572.40
  4. Step 4: Simplify right side
    921.60x = 727,611.98
  5. Step 5: Solve for x
    x = 727,611.98/921.60
  6. Step 6: Final answer
    x = 789.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.