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Finding the Fourth Proportional to 278.59, 416.98 and 148.40

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Solution

The fourth proportional to 278.59, 416.98 and 148.40 is: 222.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    278.59 : 416.98 = 148.40 : x
  2. Step 2: Convert to fraction form
    278.59/416.98 = 148.40/x
  3. Step 3: Cross multiply
    278.59x = 416.98 × 148.40
  4. Step 4: Simplify right side
    278.59x = 61,881.84
  5. Step 5: Solve for x
    x = 61,881.84/278.59
  6. Step 6: Final answer
    x = 222.13

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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.