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Finding the Fourth Proportional to 554.51, 831.76 and 143.65

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Solution

The fourth proportional to 554.51, 831.76 and 143.65 is: 215.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.51 : 831.76 = 143.65 : x
  2. Step 2: Convert to fraction form
    554.51/831.76 = 143.65/x
  3. Step 3: Cross multiply
    554.51x = 831.76 × 143.65
  4. Step 4: Simplify right side
    554.51x = 119,480.46
  5. Step 5: Solve for x
    x = 119,480.46/554.51
  6. Step 6: Final answer
    x = 215.47

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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.