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Finding the Fourth Proportional to 423.36, 630.72 and 407.76

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Solution

The fourth proportional to 423.36, 630.72 and 407.76 is: 607.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    423.36 : 630.72 = 407.76 : x
  2. Step 2: Convert to fraction form
    423.36/630.72 = 407.76/x
  3. Step 3: Cross multiply
    423.36x = 630.72 × 407.76
  4. Step 4: Simplify right side
    423.36x = 257,182.39
  5. Step 5: Solve for x
    x = 257,182.39/423.36
  6. Step 6: Final answer
    x = 607.48

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.