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Finding the Fourth Proportional to 93.79, 129.40 and 56.91

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Solution

The fourth proportional to 93.79, 129.40 and 56.91 is: 78.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.79 : 129.40 = 56.91 : x
  2. Step 2: Convert to fraction form
    93.79/129.40 = 56.91/x
  3. Step 3: Cross multiply
    93.79x = 129.40 × 56.91
  4. Step 4: Simplify right side
    93.79x = 7,364.50
  5. Step 5: Solve for x
    x = 7,364.50/93.79
  6. Step 6: Final answer
    x = 78.52

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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.