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Finding the Fourth Proportional to 37,407, 51,621.66 and 20,640

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Solution

The fourth proportional to 37,407, 51,621.66 and 20,640 is: 28,483.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    37,407 : 51,621.66 = 20,640 : x
  2. Step 2: Convert to fraction form
    37,407/51,621.66 = 20,640/x
  3. Step 3: Cross multiply
    37,407x = 51,621.66 × 20,640
  4. Step 4: Simplify right side
    37,407x = 1,065,471,062.40
  5. Step 5: Solve for x
    x = 1,065,471,062.40/37,407
  6. Step 6: Final answer
    x = 28,483.20

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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.