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Finding the Fourth Proportional to 967.80, 1,451.90 and 420.12

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Solution

The fourth proportional to 967.80, 1,451.90 and 420.12 is: 630.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.80 : 1,451.90 = 420.12 : x
  2. Step 2: Convert to fraction form
    967.80/1,451.90 = 420.12/x
  3. Step 3: Cross multiply
    967.80x = 1,451.90 × 420.12
  4. Step 4: Simplify right side
    967.80x = 609,972.23
  5. Step 5: Solve for x
    x = 609,972.23/967.80
  6. Step 6: Final answer
    x = 630.27

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1.5x scale

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.