Home / 13,210.50-18,231.30-7,621.50

Finding the Fourth Proportional to 13,210.50, 18,231.30 and 7,621.50

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Solution

The fourth proportional to 13,210.50, 18,231.30 and 7,621.50 is: 10,518.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,210.50 : 18,231.30 = 7,621.50 : x
  2. Step 2: Convert to fraction form
    13,210.50/18,231.30 = 7,621.50/x
  3. Step 3: Cross multiply
    13,210.50x = 18,231.30 × 7,621.50
  4. Step 4: Simplify right side
    13,210.50x = 138,949,852.95
  5. Step 5: Solve for x
    x = 138,949,852.95/13,210.50
  6. Step 6: Final answer
    x = 10,518.14

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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.