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Finding the Fourth Proportional to 278.51, 416.99 and 187.08

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Solution

The fourth proportional to 278.51, 416.99 and 187.08 is: 280.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.51 : 416.99 = 187.08 : x
  2. Step 2: Convert to fraction form
    278.51/416.99 = 187.08/x
  3. Step 3: Cross multiply
    278.51x = 416.99 × 187.08
  4. Step 4: Simplify right side
    278.51x = 78,009.55
  5. Step 5: Solve for x
    x = 78,009.55/278.51
  6. Step 6: Final answer
    x = 280.10

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.