Home / 15,929.21-21,980.13-9,215.12

Finding the Fourth Proportional to 15,929.21, 21,980.13 and 9,215.12

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Solution

The fourth proportional to 15,929.21, 21,980.13 and 9,215.12 is: 12,715.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,929.21 : 21,980.13 = 9,215.12 : x
  2. Step 2: Convert to fraction form
    15,929.21/21,980.13 = 9,215.12/x
  3. Step 3: Cross multiply
    15,929.21x = 21,980.13 × 9,215.12
  4. Step 4: Simplify right side
    15,929.21x = 202,549,555.96
  5. Step 5: Solve for x
    x = 202,549,555.96/15,929.21
  6. Step 6: Final answer
    x = 12,715.60

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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.