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Finding the Fourth Proportional to 18,959.77, 28,426.28 and 8,424.07

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Solution

The fourth proportional to 18,959.77, 28,426.28 and 8,424.07 is: 12,630.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,959.77 : 28,426.28 = 8,424.07 : x
  2. Step 2: Convert to fraction form
    18,959.77/28,426.28 = 8,424.07/x
  3. Step 3: Cross multiply
    18,959.77x = 28,426.28 × 8,424.07
  4. Step 4: Simplify right side
    18,959.77x = 239,464,859.37
  5. Step 5: Solve for x
    x = 239,464,859.37/18,959.77
  6. Step 6: Final answer
    x = 12,630.16

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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.