Home / 21,302.85-29,388.68-12,684.21

Finding the Fourth Proportional to 21,302.85, 29,388.68 and 12,684.21

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Solution

The fourth proportional to 21,302.85, 29,388.68 and 12,684.21 is: 17,498.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,302.85 : 29,388.68 = 12,684.21 : x
  2. Step 2: Convert to fraction form
    21,302.85/29,388.68 = 12,684.21/x
  3. Step 3: Cross multiply
    21,302.85x = 29,388.68 × 12,684.21
  4. Step 4: Simplify right side
    21,302.85x = 372,772,125.32
  5. Step 5: Solve for x
    x = 372,772,125.32/21,302.85
  6. Step 6: Final answer
    x = 17,498.70

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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.