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Finding the Fourth Proportional to 20,547, 28,354.86 and 11,115.56

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Solution

The fourth proportional to 20,547, 28,354.86 and 11,115.56 is: 15,339.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,547 : 28,354.86 = 11,115.56 : x
  2. Step 2: Convert to fraction form
    20,547/28,354.86 = 11,115.56/x
  3. Step 3: Cross multiply
    20,547x = 28,354.86 × 11,115.56
  4. Step 4: Simplify right side
    20,547x = 315,180,218.51
  5. Step 5: Solve for x
    x = 315,180,218.51/20,547
  6. Step 6: Final answer
    x = 15,339.48

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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.