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Finding the Fourth Proportional to 554.50, 831.74 and 143.63

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Solution

The fourth proportional to 554.50, 831.74 and 143.63 is: 215.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    554.50 : 831.74 = 143.63 : x
  2. Step 2: Convert to fraction form
    554.50/831.74 = 143.63/x
  3. Step 3: Cross multiply
    554.50x = 831.74 × 143.63
  4. Step 4: Simplify right side
    554.50x = 119,462.10
  5. Step 5: Solve for x
    x = 119,462.10/554.50
  6. Step 6: Final answer
    x = 215.44

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Double scale
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Similar ratio
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1.5x scale

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.