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Finding the Fourth Proportional to 99.77, 137.47 and 93.08

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Solution

The fourth proportional to 99.77, 137.47 and 93.08 is: 128.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    99.77 : 137.47 = 93.08 : x
  2. Step 2: Convert to fraction form
    99.77/137.47 = 93.08/x
  3. Step 3: Cross multiply
    99.77x = 137.47 × 93.08
  4. Step 4: Simplify right side
    99.77x = 12,795.71
  5. Step 5: Solve for x
    x = 12,795.71/99.77
  6. Step 6: Final answer
    x = 128.25

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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.