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Finding the Fourth Proportional to 28,979.52, 39,987.52 and 16,712.80

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Solution

The fourth proportional to 28,979.52, 39,987.52 and 16,712.80 is: 23,061.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,979.52 : 39,987.52 = 16,712.80 : x
  2. Step 2: Convert to fraction form
    28,979.52/39,987.52 = 16,712.80/x
  3. Step 3: Cross multiply
    28,979.52x = 39,987.52 × 16,712.80
  4. Step 4: Simplify right side
    28,979.52x = 668,303,424.26
  5. Step 5: Solve for x
    x = 668,303,424.26/28,979.52
  6. Step 6: Final answer
    x = 23,061.23

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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.