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Finding the Fourth Proportional to 420.95, 631.03 and 356.36

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Solution

The fourth proportional to 420.95, 631.03 and 356.36 is: 534.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    420.95 : 631.03 = 356.36 : x
  2. Step 2: Convert to fraction form
    420.95/631.03 = 356.36/x
  3. Step 3: Cross multiply
    420.95x = 631.03 × 356.36
  4. Step 4: Simplify right side
    420.95x = 224,875.36
  5. Step 5: Solve for x
    x = 224,875.36/420.95
  6. Step 6: Final answer
    x = 534.22

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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.