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Finding the Fourth Proportional to 474.72, 711.50 and 420.72

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Solution

The fourth proportional to 474.72, 711.50 and 420.72 is: 630.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    474.72 : 711.50 = 420.72 : x
  2. Step 2: Convert to fraction form
    474.72/711.50 = 420.72/x
  3. Step 3: Cross multiply
    474.72x = 711.50 × 420.72
  4. Step 4: Simplify right side
    474.72x = 299,342.28
  5. Step 5: Solve for x
    x = 299,342.28/474.72
  6. Step 6: Final answer
    x = 630.57

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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.