Home / 15,880.20-21,915.21-8,710.62

Finding the Fourth Proportional to 15,880.20, 21,915.21 and 8,710.62

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Solution

The fourth proportional to 15,880.20, 21,915.21 and 8,710.62 is: 12,020.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,880.20 : 21,915.21 = 8,710.62 : x
  2. Step 2: Convert to fraction form
    15,880.20/21,915.21 = 8,710.62/x
  3. Step 3: Cross multiply
    15,880.20x = 21,915.21 × 8,710.62
  4. Step 4: Simplify right side
    15,880.20x = 190,895,066.53
  5. Step 5: Solve for x
    x = 190,895,066.53/15,880.20
  6. Step 6: Final answer
    x = 12,020.95

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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.