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Finding the Fourth Proportional to 93.79, 129.43 and 51.78

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Solution

The fourth proportional to 93.79, 129.43 and 51.78 is: 71.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.79 : 129.43 = 51.78 : x
  2. Step 2: Convert to fraction form
    93.79/129.43 = 51.78/x
  3. Step 3: Cross multiply
    93.79x = 129.43 × 51.78
  4. Step 4: Simplify right side
    93.79x = 6,700.98
  5. Step 5: Solve for x
    x = 6,700.98/93.79
  6. Step 6: Final answer
    x = 71.45

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.