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Finding the Fourth Proportional to 18,918.70, 26,107.50 and 10,421.64

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Solution

The fourth proportional to 18,918.70, 26,107.50 and 10,421.64 is: 14,381.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.70 : 26,107.50 = 10,421.64 : x
  2. Step 2: Convert to fraction form
    18,918.70/26,107.50 = 10,421.64/x
  3. Step 3: Cross multiply
    18,918.70x = 26,107.50 × 10,421.64
  4. Step 4: Simplify right side
    18,918.70x = 272,082,966.30
  5. Step 5: Solve for x
    x = 272,082,966.30/18,918.70
  6. Step 6: Final answer
    x = 14,381.69

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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.