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Finding the Fourth Proportional to 28,398.64, 39,188.52 and 15,651.78

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Solution

The fourth proportional to 28,398.64, 39,188.52 and 15,651.78 is: 21,598.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,398.64 : 39,188.52 = 15,651.78 : x
  2. Step 2: Convert to fraction form
    28,398.64/39,188.52 = 15,651.78/x
  3. Step 3: Cross multiply
    28,398.64x = 39,188.52 × 15,651.78
  4. Step 4: Simplify right side
    28,398.64x = 613,370,167.04
  5. Step 5: Solve for x
    x = 613,370,167.04/28,398.64
  6. Step 6: Final answer
    x = 21,598.58

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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.