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Finding the Fourth Proportional to 12,695.80, 19,043.70 and 9,415.30

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Solution

The fourth proportional to 12,695.80, 19,043.70 and 9,415.30 is: 14,122.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,695.80 : 19,043.70 = 9,415.30 : x
  2. Step 2: Convert to fraction form
    12,695.80/19,043.70 = 9,415.30/x
  3. Step 3: Cross multiply
    12,695.80x = 19,043.70 × 9,415.30
  4. Step 4: Simplify right side
    12,695.80x = 179,302,148.61
  5. Step 5: Solve for x
    x = 179,302,148.61/12,695.80
  6. Step 6: Final answer
    x = 14,122.95

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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.