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Finding the Fourth Proportional to 338.77, 507.76 and 143.71

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Solution

The fourth proportional to 338.77, 507.76 and 143.71 is: 215.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    338.77 : 507.76 = 143.71 : x
  2. Step 2: Convert to fraction form
    338.77/507.76 = 143.71/x
  3. Step 3: Cross multiply
    338.77x = 507.76 × 143.71
  4. Step 4: Simplify right side
    338.77x = 72,970.50
  5. Step 5: Solve for x
    x = 72,970.50/338.77
  6. Step 6: Final answer
    x = 215.40

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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.