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Finding the Fourth Proportional to 967.55, 1,451.25 and 420.12

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Solution

The fourth proportional to 967.55, 1,451.25 and 420.12 is: 630.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.55 : 1,451.25 = 420.12 : x
  2. Step 2: Convert to fraction form
    967.55/1,451.25 = 420.12/x
  3. Step 3: Cross multiply
    967.55x = 1,451.25 × 420.12
  4. Step 4: Simplify right side
    967.55x = 609,699.15
  5. Step 5: Solve for x
    x = 609,699.15/967.55
  6. Step 6: Final answer
    x = 630.15

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Double scale
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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.