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Finding the Fourth Proportional to 968.76, 1,451.93 and 420.39

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Solution

The fourth proportional to 968.76, 1,451.93 and 420.39 is: 630.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    968.76 : 1,451.93 = 420.39 : x
  2. Step 2: Convert to fraction form
    968.76/1,451.93 = 420.39/x
  3. Step 3: Cross multiply
    968.76x = 1,451.93 × 420.39
  4. Step 4: Simplify right side
    968.76x = 610,374.75
  5. Step 5: Solve for x
    x = 610,374.75/968.76
  6. Step 6: Final answer
    x = 630.06

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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.