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Finding the Fourth Proportional to 28,891.76, 39,870.62 and 15,643.76

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Solution

The fourth proportional to 28,891.76, 39,870.62 and 15,643.76 is: 21,588.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,891.76 : 39,870.62 = 15,643.76 : x
  2. Step 2: Convert to fraction form
    28,891.76/39,870.62 = 15,643.76/x
  3. Step 3: Cross multiply
    28,891.76x = 39,870.62 × 15,643.76
  4. Step 4: Simplify right side
    28,891.76x = 623,726,410.33
  5. Step 5: Solve for x
    x = 623,726,410.33/28,891.76
  6. Step 6: Final answer
    x = 21,588.38

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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.