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Finding the Fourth Proportional to 28,772.40, 39,706.86 and 15,851.08

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Solution

The fourth proportional to 28,772.40, 39,706.86 and 15,851.08 is: 21,875.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,772.40 : 39,706.86 = 15,851.08 : x
  2. Step 2: Convert to fraction form
    28,772.40/39,706.86 = 15,851.08/x
  3. Step 3: Cross multiply
    28,772.40x = 39,706.86 × 15,851.08
  4. Step 4: Simplify right side
    28,772.40x = 629,396,614.41
  5. Step 5: Solve for x
    x = 629,396,614.41/28,772.40
  6. Step 6: Final answer
    x = 21,875.01

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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.