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Finding the Fourth Proportional to 15,220, 21,005.59 and 8,507.03

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Solution

The fourth proportional to 15,220, 21,005.59 and 8,507.03 is: 11,740.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,220 : 21,005.59 = 8,507.03 : x
  2. Step 2: Convert to fraction form
    15,220/21,005.59 = 8,507.03/x
  3. Step 3: Cross multiply
    15,220x = 21,005.59 × 8,507.03
  4. Step 4: Simplify right side
    15,220x = 178,695,079.27
  5. Step 5: Solve for x
    x = 178,695,079.27/15,220
  6. Step 6: Final answer
    x = 11,740.81

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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.