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Finding the Fourth Proportional to 921.88, 1,272.20 and 502.22

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Solution

The fourth proportional to 921.88, 1,272.20 and 502.22 is: 693.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.88 : 1,272.20 = 502.22 : x
  2. Step 2: Convert to fraction form
    921.88/1,272.20 = 502.22/x
  3. Step 3: Cross multiply
    921.88x = 1,272.20 × 502.22
  4. Step 4: Simplify right side
    921.88x = 638,924.28
  5. Step 5: Solve for x
    x = 638,924.28/921.88
  6. Step 6: Final answer
    x = 693.07

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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.