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Finding the Fourth Proportional to 10,998.45, 15,419.70 and 10,998.45

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Solution

The fourth proportional to 10,998.45, 15,419.70 and 10,998.45 is: 15,419.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,998.45 : 15,419.70 = 10,998.45 : x
  2. Step 2: Convert to fraction form
    10,998.45/15,419.70 = 10,998.45/x
  3. Step 3: Cross multiply
    10,998.45x = 15,419.70 × 10,998.45
  4. Step 4: Simplify right side
    10,998.45x = 169,592,799.47
  5. Step 5: Solve for x
    x = 169,592,799.47/10,998.45
  6. Step 6: Final answer
    x = 15,419.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.40) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.