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Finding the Fourth Proportional to 1,335.52, 1,842.70 and 811.45

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Solution

The fourth proportional to 1,335.52, 1,842.70 and 811.45 is: 1,119.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,335.52 : 1,842.70 = 811.45 : x
  2. Step 2: Convert to fraction form
    1,335.52/1,842.70 = 811.45/x
  3. Step 3: Cross multiply
    1,335.52x = 1,842.70 × 811.45
  4. Step 4: Simplify right side
    1,335.52x = 1,495,258.92
  5. Step 5: Solve for x
    x = 1,495,258.92/1,335.52
  6. Step 6: Final answer
    x = 1,119.61

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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.