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Finding the Fourth Proportional to 18,995.87, 28,492.95 and 12,758.51

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Solution

The fourth proportional to 18,995.87, 28,492.95 and 12,758.51 is: 19,137.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,995.87 : 28,492.95 = 12,758.51 : x
  2. Step 2: Convert to fraction form
    18,995.87/28,492.95 = 12,758.51/x
  3. Step 3: Cross multiply
    18,995.87x = 28,492.95 × 12,758.51
  4. Step 4: Simplify right side
    18,995.87x = 363,527,587.50
  5. Step 5: Solve for x
    x = 363,527,587.50/18,995.87
  6. Step 6: Final answer
    x = 19,137.19

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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.