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Finding the Fourth Proportional to 278.76, 417.80 and 157.13

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Solution

The fourth proportional to 278.76, 417.80 and 157.13 is: 235.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.76 : 417.80 = 157.13 : x
  2. Step 2: Convert to fraction form
    278.76/417.80 = 157.13/x
  3. Step 3: Cross multiply
    278.76x = 417.80 × 157.13
  4. Step 4: Simplify right side
    278.76x = 65,647.22
  5. Step 5: Solve for x
    x = 65,647.22/278.76
  6. Step 6: Final answer
    x = 235.50

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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.