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Finding the Fourth Proportional to 491.28, 737.76 and 440.40

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Solution

The fourth proportional to 491.28, 737.76 and 440.40 is: 661.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    491.28 : 737.76 = 440.40 : x
  2. Step 2: Convert to fraction form
    491.28/737.76 = 440.40/x
  3. Step 3: Cross multiply
    491.28x = 737.76 × 440.40
  4. Step 4: Simplify right side
    491.28x = 324,909.50
  5. Step 5: Solve for x
    x = 324,909.50/491.28
  6. Step 6: Final answer
    x = 661.35

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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.