Home / 13,113.20-19,669.80-10,521.20

Finding the Fourth Proportional to 13,113.20, 19,669.80 and 10,521.20

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Solution

The fourth proportional to 13,113.20, 19,669.80 and 10,521.20 is: 15,781.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,113.20 : 19,669.80 = 10,521.20 : x
  2. Step 2: Convert to fraction form
    13,113.20/19,669.80 = 10,521.20/x
  3. Step 3: Cross multiply
    13,113.20x = 19,669.80 × 10,521.20
  4. Step 4: Simplify right side
    13,113.20x = 206,949,899.76
  5. Step 5: Solve for x
    x = 206,949,899.76/13,113.20
  6. Step 6: Final answer
    x = 15,781.80

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1.5x scale

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.