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Finding the Fourth Proportional to 386.94, 580.66 and 143.47

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Solution

The fourth proportional to 386.94, 580.66 and 143.47 is: 215.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    386.94 : 580.66 = 143.47 : x
  2. Step 2: Convert to fraction form
    386.94/580.66 = 143.47/x
  3. Step 3: Cross multiply
    386.94x = 580.66 × 143.47
  4. Step 4: Simplify right side
    386.94x = 83,307.29
  5. Step 5: Solve for x
    x = 83,307.29/386.94
  6. Step 6: Final answer
    x = 215.30

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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.