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Finding the Fourth Proportional to 18,913.79, 26,083.80 and 15,137.30

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Solution

The fourth proportional to 18,913.79, 26,083.80 and 15,137.30 is: 20,875.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,913.79 : 26,083.80 = 15,137.30 : x
  2. Step 2: Convert to fraction form
    18,913.79/26,083.80 = 15,137.30/x
  3. Step 3: Cross multiply
    18,913.79x = 26,083.80 × 15,137.30
  4. Step 4: Simplify right side
    18,913.79x = 394,838,175.32
  5. Step 5: Solve for x
    x = 394,838,175.32/18,913.79
  6. Step 6: Final answer
    x = 20,875.68

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.