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Finding the Fourth Proportional to 614.40, 921.60 and 357.76

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Solution

The fourth proportional to 614.40, 921.60 and 357.76 is: 536.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    614.40 : 921.60 = 357.76 : x
  2. Step 2: Convert to fraction form
    614.40/921.60 = 357.76/x
  3. Step 3: Cross multiply
    614.40x = 921.60 × 357.76
  4. Step 4: Simplify right side
    614.40x = 329,711.62
  5. Step 5: Solve for x
    x = 329,711.62/614.40
  6. Step 6: Final answer
    x = 536.64

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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.