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Finding the Fourth Proportional to 1,239.84, 1,854.56 and 1,221

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Solution

The fourth proportional to 1,239.84, 1,854.56 and 1,221 is: 1,826.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,239.84 : 1,854.56 = 1,221 : x
  2. Step 2: Convert to fraction form
    1,239.84/1,854.56 = 1,221/x
  3. Step 3: Cross multiply
    1,239.84x = 1,854.56 × 1,221
  4. Step 4: Simplify right side
    1,239.84x = 2,264,417.76
  5. Step 5: Solve for x
    x = 2,264,417.76/1,239.84
  6. Step 6: Final answer
    x = 1,826.38

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.