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Finding the Fourth Proportional to 1,098.84, 1,648.56 and 612.21

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Solution

The fourth proportional to 1,098.84, 1,648.56 and 612.21 is: 918.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,098.84 : 1,648.56 = 612.21 : x
  2. Step 2: Convert to fraction form
    1,098.84/1,648.56 = 612.21/x
  3. Step 3: Cross multiply
    1,098.84x = 1,648.56 × 612.21
  4. Step 4: Simplify right side
    1,098.84x = 1,009,264.92
  5. Step 5: Solve for x
    x = 1,009,264.92/1,098.84
  6. Step 6: Final answer
    x = 918.48

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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.