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Finding the Fourth Proportional to 18,939.84, 26,133.93 and 10,980.51

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Solution

The fourth proportional to 18,939.84, 26,133.93 and 10,980.51 is: 15,151.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,939.84 : 26,133.93 = 10,980.51 : x
  2. Step 2: Convert to fraction form
    18,939.84/26,133.93 = 10,980.51/x
  3. Step 3: Cross multiply
    18,939.84x = 26,133.93 × 10,980.51
  4. Step 4: Simplify right side
    18,939.84x = 286,963,879.70
  5. Step 5: Solve for x
    x = 286,963,879.70/18,939.84
  6. Step 6: Final answer
    x = 15,151.34

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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.