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Finding the Fourth Proportional to 177.65, 244.90 and 128.45

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Solution

The fourth proportional to 177.65, 244.90 and 128.45 is: 177.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    177.65 : 244.90 = 128.45 : x
  2. Step 2: Convert to fraction form
    177.65/244.90 = 128.45/x
  3. Step 3: Cross multiply
    177.65x = 244.90 × 128.45
  4. Step 4: Simplify right side
    177.65x = 31,457.41
  5. Step 5: Solve for x
    x = 31,457.41/177.65
  6. Step 6: Final answer
    x = 177.08

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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.