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Finding the Fourth Proportional to 921.79, 1,272.08 and 502.15

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Solution

The fourth proportional to 921.79, 1,272.08 and 502.15 is: 692.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    921.79 : 1,272.08 = 502.15 : x
  2. Step 2: Convert to fraction form
    921.79/1,272.08 = 502.15/x
  3. Step 3: Cross multiply
    921.79x = 1,272.08 × 502.15
  4. Step 4: Simplify right side
    921.79x = 638,774.97
  5. Step 5: Solve for x
    x = 638,774.97/921.79
  6. Step 6: Final answer
    x = 692.97

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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.