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Finding the Fourth Proportional to 923.02, 1,273.98 and 643.84

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Solution

The fourth proportional to 923.02, 1,273.98 and 643.84 is: 888.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    923.02 : 1,273.98 = 643.84 : x
  2. Step 2: Convert to fraction form
    923.02/1,273.98 = 643.84/x
  3. Step 3: Cross multiply
    923.02x = 1,273.98 × 643.84
  4. Step 4: Simplify right side
    923.02x = 820,239.28
  5. Step 5: Solve for x
    x = 820,239.28/923.02
  6. Step 6: Final answer
    x = 888.65

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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.