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Finding the Fourth Proportional to 554.29, 831.45 and 143.43

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Solution

The fourth proportional to 554.29, 831.45 and 143.43 is: 215.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.29 : 831.45 = 143.43 : x
  2. Step 2: Convert to fraction form
    554.29/831.45 = 143.43/x
  3. Step 3: Cross multiply
    554.29x = 831.45 × 143.43
  4. Step 4: Simplify right side
    554.29x = 119,254.87
  5. Step 5: Solve for x
    x = 119,254.87/554.29
  6. Step 6: Final answer
    x = 215.15

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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.