Home / 15,685.25-21,505.30-15,404.58

Finding the Fourth Proportional to 15,685.25, 21,505.30 and 15,404.58

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Solution

The fourth proportional to 15,685.25, 21,505.30 and 15,404.58 is: 21,120.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,685.25 : 21,505.30 = 15,404.58 : x
  2. Step 2: Convert to fraction form
    15,685.25/21,505.30 = 15,404.58/x
  3. Step 3: Cross multiply
    15,685.25x = 21,505.30 × 15,404.58
  4. Step 4: Simplify right side
    15,685.25x = 331,280,075.76
  5. Step 5: Solve for x
    x = 331,280,075.76/15,685.25
  6. Step 6: Final answer
    x = 21,120.49

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.