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Finding the Fourth Proportional to 1,445.76, 2,168.64 and 420.48

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Solution

The fourth proportional to 1,445.76, 2,168.64 and 420.48 is: 630.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,445.76 : 2,168.64 = 420.48 : x
  2. Step 2: Convert to fraction form
    1,445.76/2,168.64 = 420.48/x
  3. Step 3: Cross multiply
    1,445.76x = 2,168.64 × 420.48
  4. Step 4: Simplify right side
    1,445.76x = 911,869.75
  5. Step 5: Solve for x
    x = 911,869.75/1,445.76
  6. Step 6: Final answer
    x = 630.72

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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.