Home / 20,515.21-28,329.65-15,470.80

Finding the Fourth Proportional to 20,515.21, 28,329.65 and 15,470.80

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Solution

The fourth proportional to 20,515.21, 28,329.65 and 15,470.80 is: 21,363.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,515.21 : 28,329.65 = 15,470.80 : x
  2. Step 2: Convert to fraction form
    20,515.21/28,329.65 = 15,470.80/x
  3. Step 3: Cross multiply
    20,515.21x = 28,329.65 × 15,470.80
  4. Step 4: Simplify right side
    20,515.21x = 438,282,259.06
  5. Step 5: Solve for x
    x = 438,282,259.06/20,515.21
  6. Step 6: Final answer
    x = 21,363.77

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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.