Home / 28,420.65-39,220.79-15,674.31

Finding the Fourth Proportional to 28,420.65, 39,220.79 and 15,674.31

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Solution

The fourth proportional to 28,420.65, 39,220.79 and 15,674.31 is: 21,630.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,420.65 : 39,220.79 = 15,674.31 : x
  2. Step 2: Convert to fraction form
    28,420.65/39,220.79 = 15,674.31/x
  3. Step 3: Cross multiply
    28,420.65x = 39,220.79 × 15,674.31
  4. Step 4: Simplify right side
    28,420.65x = 614,758,742.53
  5. Step 5: Solve for x
    x = 614,758,742.53/28,420.65
  6. Step 6: Final answer
    x = 21,630.71

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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.