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Finding the Fourth Proportional to 614.48, 921.20 and 290

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Solution

The fourth proportional to 614.48, 921.20 and 290 is: 434.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.48 : 921.20 = 290 : x
  2. Step 2: Convert to fraction form
    614.48/921.20 = 290/x
  3. Step 3: Cross multiply
    614.48x = 921.20 × 290
  4. Step 4: Simplify right side
    614.48x = 267,148
  5. Step 5: Solve for x
    x = 267,148/614.48
  6. Step 6: Final answer
    x = 434.75

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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.