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Finding the Fourth Proportional to 485.13, 727.71 and 143.13

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Solution

The fourth proportional to 485.13, 727.71 and 143.13 is: 214.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    485.13 : 727.71 = 143.13 : x
  2. Step 2: Convert to fraction form
    485.13/727.71 = 143.13/x
  3. Step 3: Cross multiply
    485.13x = 727.71 × 143.13
  4. Step 4: Simplify right side
    485.13x = 104,157.13
  5. Step 5: Solve for x
    x = 104,157.13/485.13
  6. Step 6: Final answer
    x = 214.70

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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.