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Finding the Fourth Proportional to 15,391, 21,241.65 and 8,677.99

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Solution

The fourth proportional to 15,391, 21,241.65 and 8,677.99 is: 11,976.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,391 : 21,241.65 = 8,677.99 : x
  2. Step 2: Convert to fraction form
    15,391/21,241.65 = 8,677.99/x
  3. Step 3: Cross multiply
    15,391x = 21,241.65 × 8,677.99
  4. Step 4: Simplify right side
    15,391x = 184,334,826.28
  5. Step 5: Solve for x
    x = 184,334,826.28/15,391
  6. Step 6: Final answer
    x = 11,976.79

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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.