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Finding the Fourth Proportional to 19,398.69, 28,966.55 and 15,405.12

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Solution

The fourth proportional to 19,398.69, 28,966.55 and 15,405.12 is: 23,003.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,398.69 : 28,966.55 = 15,405.12 : x
  2. Step 2: Convert to fraction form
    19,398.69/28,966.55 = 15,405.12/x
  3. Step 3: Cross multiply
    19,398.69x = 28,966.55 × 15,405.12
  4. Step 4: Simplify right side
    19,398.69x = 446,233,101.71
  5. Step 5: Solve for x
    x = 446,233,101.71/19,398.69
  6. Step 6: Final answer
    x = 23,003.26

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.