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Finding the Fourth Proportional to 15,807.80, 23,690.10 and 12,891.80

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Solution

The fourth proportional to 15,807.80, 23,690.10 and 12,891.80 is: 19,320.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,807.80 : 23,690.10 = 12,891.80 : x
  2. Step 2: Convert to fraction form
    15,807.80/23,690.10 = 12,891.80/x
  3. Step 3: Cross multiply
    15,807.80x = 23,690.10 × 12,891.80
  4. Step 4: Simplify right side
    15,807.80x = 305,408,031.18
  5. Step 5: Solve for x
    x = 305,408,031.18/15,807.80
  6. Step 6: Final answer
    x = 19,320.08

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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.