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Finding the Fourth Proportional to 1,212.90, 1,818.28 and 554.44

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Solution

The fourth proportional to 1,212.90, 1,818.28 and 554.44 is: 831.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,212.90 : 1,818.28 = 554.44 : x
  2. Step 2: Convert to fraction form
    1,212.90/1,818.28 = 554.44/x
  3. Step 3: Cross multiply
    1,212.90x = 1,818.28 × 554.44
  4. Step 4: Simplify right side
    1,212.90x = 1,008,127.16
  5. Step 5: Solve for x
    x = 1,008,127.16/1,212.90
  6. Step 6: Final answer
    x = 831.17

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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.