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Finding the Fourth Proportional to 1,335, 1,842.78 and 922.20

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Solution

The fourth proportional to 1,335, 1,842.78 and 922.20 is: 1,272.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335 : 1,842.78 = 922.20 : x
  2. Step 2: Convert to fraction form
    1,335/1,842.78 = 922.20/x
  3. Step 3: Cross multiply
    1,335x = 1,842.78 × 922.20
  4. Step 4: Simplify right side
    1,335x = 1,699,411.72
  5. Step 5: Solve for x
    x = 1,699,411.72/1,335
  6. Step 6: Final answer
    x = 1,272.97

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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.