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Finding the Fourth Proportional to 20,920.71, 28,875.75 and 11,973.31

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Solution

The fourth proportional to 20,920.71, 28,875.75 and 11,973.31 is: 16,526.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.71 : 28,875.75 = 11,973.31 : x
  2. Step 2: Convert to fraction form
    20,920.71/28,875.75 = 11,973.31/x
  3. Step 3: Cross multiply
    20,920.71x = 28,875.75 × 11,973.31
  4. Step 4: Simplify right side
    20,920.71x = 345,738,339.68
  5. Step 5: Solve for x
    x = 345,738,339.68/20,920.71
  6. Step 6: Final answer
    x = 16,526.13

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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.