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Finding the Fourth Proportional to 55.64, 83.40 and 20.94

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Solution

The fourth proportional to 55.64, 83.40 and 20.94 is: 31.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    55.64 : 83.40 = 20.94 : x
  2. Step 2: Convert to fraction form
    55.64/83.40 = 20.94/x
  3. Step 3: Cross multiply
    55.64x = 83.40 × 20.94
  4. Step 4: Simplify right side
    55.64x = 1,746.47
  5. Step 5: Solve for x
    x = 1,746.47/55.64
  6. Step 6: Final answer
    x = 31.39

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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.