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Finding the Fourth Proportional to 18,938.61, 26,135.03 and 10,980.63

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Solution

The fourth proportional to 18,938.61, 26,135.03 and 10,980.63 is: 15,153.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,938.61 : 26,135.03 = 10,980.63 : x
  2. Step 2: Convert to fraction form
    18,938.61/26,135.03 = 10,980.63/x
  3. Step 3: Cross multiply
    18,938.61x = 26,135.03 × 10,980.63
  4. Step 4: Simplify right side
    18,938.61x = 286,979,039.57
  5. Step 5: Solve for x
    x = 286,979,039.57/18,938.61
  6. Step 6: Final answer
    x = 15,153.12

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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.