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Finding the Fourth Proportional to 20,646.78, 28,492.50 and 11,215.50

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Solution

The fourth proportional to 20,646.78, 28,492.50 and 11,215.50 is: 15,477.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,646.78 : 28,492.50 = 11,215.50 : x
  2. Step 2: Convert to fraction form
    20,646.78/28,492.50 = 11,215.50/x
  3. Step 3: Cross multiply
    20,646.78x = 28,492.50 × 11,215.50
  4. Step 4: Simplify right side
    20,646.78x = 319,557,633.75
  5. Step 5: Solve for x
    x = 319,557,633.75/20,646.78
  6. Step 6: Final answer
    x = 15,477.36

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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.