Home / 15,398.10-21,290.85-13,429.80

Finding the Fourth Proportional to 15,398.10, 21,290.85 and 13,429.80

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Solution

The fourth proportional to 15,398.10, 21,290.85 and 13,429.80 is: 18,569.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,398.10 : 21,290.85 = 13,429.80 : x
  2. Step 2: Convert to fraction form
    15,398.10/21,290.85 = 13,429.80/x
  3. Step 3: Cross multiply
    15,398.10x = 21,290.85 × 13,429.80
  4. Step 4: Simplify right side
    15,398.10x = 285,931,857.33
  5. Step 5: Solve for x
    x = 285,931,857.33/15,398.10
  6. Step 6: Final answer
    x = 18,569.29

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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.