Home / 15,511.32-21,420.76-13,260.12

Finding the Fourth Proportional to 15,511.32, 21,420.76 and 13,260.12

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Solution

The fourth proportional to 15,511.32, 21,420.76 and 13,260.12 is: 18,311.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,511.32 : 21,420.76 = 13,260.12 : x
  2. Step 2: Convert to fraction form
    15,511.32/21,420.76 = 13,260.12/x
  3. Step 3: Cross multiply
    15,511.32x = 21,420.76 × 13,260.12
  4. Step 4: Simplify right side
    15,511.32x = 284,041,848.09
  5. Step 5: Solve for x
    x = 284,041,848.09/15,511.32
  6. Step 6: Final answer
    x = 18,311.91

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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.