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Finding the Fourth Proportional to 155.65, 214.80 and 90.16

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Solution

The fourth proportional to 155.65, 214.80 and 90.16 is: 124.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    155.65 : 214.80 = 90.16 : x
  2. Step 2: Convert to fraction form
    155.65/214.80 = 90.16/x
  3. Step 3: Cross multiply
    155.65x = 214.80 × 90.16
  4. Step 4: Simplify right side
    155.65x = 19,365.29
  5. Step 5: Solve for x
    x = 19,365.29/155.65
  6. Step 6: Final answer
    x = 124.42

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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.