Home / 15,720.16-21,693.39-8,915.43

Finding the Fourth Proportional to 15,720.16, 21,693.39 and 8,915.43

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Solution

The fourth proportional to 15,720.16, 21,693.39 and 8,915.43 is: 12,303.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,720.16 : 21,693.39 = 8,915.43 : x
  2. Step 2: Convert to fraction form
    15,720.16/21,693.39 = 8,915.43/x
  3. Step 3: Cross multiply
    15,720.16x = 21,693.39 × 8,915.43
  4. Step 4: Simplify right side
    15,720.16x = 193,405,900.01
  5. Step 5: Solve for x
    x = 193,405,900.01/15,720.16
  6. Step 6: Final answer
    x = 12,303.05

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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.