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Finding the Fourth Proportional to 19,521, 29,272.32 and 8,420.76

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Solution

The fourth proportional to 19,521, 29,272.32 and 8,420.76 is: 12,627.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,521 : 29,272.32 = 8,420.76 : x
  2. Step 2: Convert to fraction form
    19,521/29,272.32 = 8,420.76/x
  3. Step 3: Cross multiply
    19,521x = 29,272.32 × 8,420.76
  4. Step 4: Simplify right side
    19,521x = 246,495,181.36
  5. Step 5: Solve for x
    x = 246,495,181.36/19,521
  6. Step 6: Final answer
    x = 12,627.18

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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.