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Finding the Fourth Proportional to 921.36, 1,271.18 and 724.24

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Solution

The fourth proportional to 921.36, 1,271.18 and 724.24 is: 999.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.36 : 1,271.18 = 724.24 : x
  2. Step 2: Convert to fraction form
    921.36/1,271.18 = 724.24/x
  3. Step 3: Cross multiply
    921.36x = 1,271.18 × 724.24
  4. Step 4: Simplify right side
    921.36x = 920,639.40
  5. Step 5: Solve for x
    x = 920,639.40/921.36
  6. Step 6: Final answer
    x = 999.22

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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.