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Finding the Fourth Proportional to 13,699.69, 18,905.70 and 7,412.20

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Solution

The fourth proportional to 13,699.69, 18,905.70 and 7,412.20 is: 10,228.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,699.69 : 18,905.70 = 7,412.20 : x
  2. Step 2: Convert to fraction form
    13,699.69/18,905.70 = 7,412.20/x
  3. Step 3: Cross multiply
    13,699.69x = 18,905.70 × 7,412.20
  4. Step 4: Simplify right side
    13,699.69x = 140,132,810.07
  5. Step 5: Solve for x
    x = 140,132,810.07/13,699.69
  6. Step 6: Final answer
    x = 10,228.91

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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.