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Finding the Fourth Proportional to 72.66, 100.35 and 56.31

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Solution

The fourth proportional to 72.66, 100.35 and 56.31 is: 77.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    72.66 : 100.35 = 56.31 : x
  2. Step 2: Convert to fraction form
    72.66/100.35 = 56.31/x
  3. Step 3: Cross multiply
    72.66x = 100.35 × 56.31
  4. Step 4: Simplify right side
    72.66x = 5,650.71
  5. Step 5: Solve for x
    x = 5,650.71/72.66
  6. Step 6: Final answer
    x = 77.77

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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.