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Finding the Fourth Proportional to 93.42, 129.54 and 90.35

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Solution

The fourth proportional to 93.42, 129.54 and 90.35 is: 125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.42 : 129.54 = 90.35 : x
  2. Step 2: Convert to fraction form
    93.42/129.54 = 90.35/x
  3. Step 3: Cross multiply
    93.42x = 129.54 × 90.35
  4. Step 4: Simplify right side
    93.42x = 11,703.29
  5. Step 5: Solve for x
    x = 11,703.29/93.42
  6. Step 6: Final answer
    x = 125.28

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.