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Finding the Fourth Proportional to 38,689.88, 53,396.44 and 21,698.68

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Solution

The fourth proportional to 38,689.88, 53,396.44 and 21,698.68 is: 29,946.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,689.88 : 53,396.44 = 21,698.68 : x
  2. Step 2: Convert to fraction form
    38,689.88/53,396.44 = 21,698.68/x
  3. Step 3: Cross multiply
    38,689.88x = 53,396.44 × 21,698.68
  4. Step 4: Simplify right side
    38,689.88x = 1,158,632,264.70
  5. Step 5: Solve for x
    x = 1,158,632,264.70/38,689.88
  6. Step 6: Final answer
    x = 29,946.65

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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.