Home / 18,720.21-28,088.47-10,929.03

Finding the Fourth Proportional to 18,720.21, 28,088.47 and 10,929.03

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Solution

The fourth proportional to 18,720.21, 28,088.47 and 10,929.03 is: 16,398.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,720.21 : 28,088.47 = 10,929.03 : x
  2. Step 2: Convert to fraction form
    18,720.21/28,088.47 = 10,929.03/x
  3. Step 3: Cross multiply
    18,720.21x = 28,088.47 × 10,929.03
  4. Step 4: Simplify right side
    18,720.21x = 306,979,639.61
  5. Step 5: Solve for x
    x = 306,979,639.61/18,720.21
  6. Step 6: Final answer
    x = 16,398.30

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.