Home / 28,172.84-38,877-15,423.55

Finding the Fourth Proportional to 28,172.84, 38,877 and 15,423.55

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Solution

The fourth proportional to 28,172.84, 38,877 and 15,423.55 is: 21,283.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,172.84 : 38,877 = 15,423.55 : x
  2. Step 2: Convert to fraction form
    28,172.84/38,877 = 15,423.55/x
  3. Step 3: Cross multiply
    28,172.84x = 38,877 × 15,423.55
  4. Step 4: Simplify right side
    28,172.84x = 599,621,158.97
  5. Step 5: Solve for x
    x = 599,621,158.97/28,172.84
  6. Step 6: Final answer
    x = 21,283.66

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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.