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Finding the Fourth Proportional to 20,699.64, 28,564.92 and 12,201.93

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Solution

The fourth proportional to 20,699.64, 28,564.92 and 12,201.93 is: 16,838.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,699.64 : 28,564.92 = 12,201.93 : x
  2. Step 2: Convert to fraction form
    20,699.64/28,564.92 = 12,201.93/x
  3. Step 3: Cross multiply
    20,699.64x = 28,564.92 × 12,201.93
  4. Step 4: Simplify right side
    20,699.64x = 348,547,154.30
  5. Step 5: Solve for x
    x = 348,547,154.30/20,699.64
  6. Step 6: Final answer
    x = 16,838.32

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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.