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Finding the Fourth Proportional to 42,420, 63,630 and 13,236

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Solution

The fourth proportional to 42,420, 63,630 and 13,236 is: 19,854

Step by Step Solution

  1. Step 1: Write the proportion equation
    42,420 : 63,630 = 13,236 : x
  2. Step 2: Convert to fraction form
    42,420/63,630 = 13,236/x
  3. Step 3: Cross multiply
    42,420x = 63,630 × 13,236
  4. Step 4: Simplify right side
    42,420x = 842,206,680
  5. Step 5: Solve for x
    x = 842,206,680/42,420
  6. Step 6: Final answer
    x = 19,854

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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.