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Finding the Fourth Proportional to 19,187.76, 26,478.70 and 10,689.87

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Solution

The fourth proportional to 19,187.76, 26,478.70 and 10,689.87 is: 14,751.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,187.76 : 26,478.70 = 10,689.87 : x
  2. Step 2: Convert to fraction form
    19,187.76/26,478.70 = 10,689.87/x
  3. Step 3: Cross multiply
    19,187.76x = 26,478.70 × 10,689.87
  4. Step 4: Simplify right side
    19,187.76x = 283,053,728.38
  5. Step 5: Solve for x
    x = 283,053,728.38/19,187.76
  6. Step 6: Final answer
    x = 14,751.79

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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.