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Finding the Fourth Proportional to 508.77, 763.20 and 143.55

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Solution

The fourth proportional to 508.77, 763.20 and 143.55 is: 215.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    508.77 : 763.20 = 143.55 : x
  2. Step 2: Convert to fraction form
    508.77/763.20 = 143.55/x
  3. Step 3: Cross multiply
    508.77x = 763.20 × 143.55
  4. Step 4: Simplify right side
    508.77x = 109,557.36
  5. Step 5: Solve for x
    x = 109,557.36/508.77
  6. Step 6: Final answer
    x = 215.34

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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.