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Finding the Fourth Proportional to 18,288.90, 25,238.66 and 9,905.40

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Solution

The fourth proportional to 18,288.90, 25,238.66 and 9,905.40 is: 13,669.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,288.90 : 25,238.66 = 9,905.40 : x
  2. Step 2: Convert to fraction form
    18,288.90/25,238.66 = 9,905.40/x
  3. Step 3: Cross multiply
    18,288.90x = 25,238.66 × 9,905.40
  4. Step 4: Simplify right side
    18,288.90x = 249,999,022.76
  5. Step 5: Solve for x
    x = 249,999,022.76/18,288.90
  6. Step 6: Final answer
    x = 13,669.44

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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.