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Finding the Fourth Proportional to 15,390.81, 21,239.42 and 8,317.22

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Solution

The fourth proportional to 15,390.81, 21,239.42 and 8,317.22 is: 11,477.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,390.81 : 21,239.42 = 8,317.22 : x
  2. Step 2: Convert to fraction form
    15,390.81/21,239.42 = 8,317.22/x
  3. Step 3: Cross multiply
    15,390.81x = 21,239.42 × 8,317.22
  4. Step 4: Simplify right side
    15,390.81x = 176,652,781.03
  5. Step 5: Solve for x
    x = 176,652,781.03/15,390.81
  6. Step 6: Final answer
    x = 11,477.81

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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.