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Finding the Fourth Proportional to 79.51, 109.56 and 56.22

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Solution

The fourth proportional to 79.51, 109.56 and 56.22 is: 77.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    79.51 : 109.56 = 56.22 : x
  2. Step 2: Convert to fraction form
    79.51/109.56 = 56.22/x
  3. Step 3: Cross multiply
    79.51x = 109.56 × 56.22
  4. Step 4: Simplify right side
    79.51x = 6,159.56
  5. Step 5: Solve for x
    x = 6,159.56/79.51
  6. Step 6: Final answer
    x = 77.47

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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.