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Finding the Fourth Proportional to 28,355.25, 39,130.25 and 15,780.01

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Solution

The fourth proportional to 28,355.25, 39,130.25 and 15,780.01 is: 21,776.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,355.25 : 39,130.25 = 15,780.01 : x
  2. Step 2: Convert to fraction form
    28,355.25/39,130.25 = 15,780.01/x
  3. Step 3: Cross multiply
    28,355.25x = 39,130.25 × 15,780.01
  4. Step 4: Simplify right side
    28,355.25x = 617,475,736.30
  5. Step 5: Solve for x
    x = 617,475,736.30/28,355.25
  6. Step 6: Final answer
    x = 21,776.42

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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.