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Finding the Fourth Proportional to 374.79, 561.87 and 143.63

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Solution

The fourth proportional to 374.79, 561.87 and 143.63 is: 215.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    374.79 : 561.87 = 143.63 : x
  2. Step 2: Convert to fraction form
    374.79/561.87 = 143.63/x
  3. Step 3: Cross multiply
    374.79x = 561.87 × 143.63
  4. Step 4: Simplify right side
    374.79x = 80,701.39
  5. Step 5: Solve for x
    x = 80,701.39/374.79
  6. Step 6: Final answer
    x = 215.32

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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.