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Finding the Fourth Proportional to 93.02, 128.34 and 56.20

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Solution

The fourth proportional to 93.02, 128.34 and 56.20 is: 77.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.02 : 128.34 = 56.20 : x
  2. Step 2: Convert to fraction form
    93.02/128.34 = 56.20/x
  3. Step 3: Cross multiply
    93.02x = 128.34 × 56.20
  4. Step 4: Simplify right side
    93.02x = 7,212.71
  5. Step 5: Solve for x
    x = 7,212.71/93.02
  6. Step 6: Final answer
    x = 77.54

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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.