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Finding the Fourth Proportional to 15,391.83, 21,238 and 8,677.45

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Solution

The fourth proportional to 15,391.83, 21,238 and 8,677.45 is: 11,973.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,391.83 : 21,238 = 8,677.45 : x
  2. Step 2: Convert to fraction form
    15,391.83/21,238 = 8,677.45/x
  3. Step 3: Cross multiply
    15,391.83x = 21,238 × 8,677.45
  4. Step 4: Simplify right side
    15,391.83x = 184,291,683.10
  5. Step 5: Solve for x
    x = 184,291,683.10/15,391.83
  6. Step 6: Final answer
    x = 11,973.34

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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.