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Finding the Fourth Proportional to 13,347.56, 18,421.89 and 7,970.78

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Solution

The fourth proportional to 13,347.56, 18,421.89 and 7,970.78 is: 11,001.02

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,347.56 : 18,421.89 = 7,970.78 : x
  2. Step 2: Convert to fraction form
    13,347.56/18,421.89 = 7,970.78/x
  3. Step 3: Cross multiply
    13,347.56x = 18,421.89 × 7,970.78
  4. Step 4: Simplify right side
    13,347.56x = 146,836,832.37
  5. Step 5: Solve for x
    x = 146,836,832.37/13,347.56
  6. Step 6: Final answer
    x = 11,001.02

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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.