Home / 21,215.36-29,280-12,830.24

Finding the Fourth Proportional to 21,215.36, 29,280 and 12,830.24

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Solution

The fourth proportional to 21,215.36, 29,280 and 12,830.24 is: 17,707.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,215.36 : 29,280 = 12,830.24 : x
  2. Step 2: Convert to fraction form
    21,215.36/29,280 = 12,830.24/x
  3. Step 3: Cross multiply
    21,215.36x = 29,280 × 12,830.24
  4. Step 4: Simplify right side
    21,215.36x = 375,669,427.20
  5. Step 5: Solve for x
    x = 375,669,427.20/21,215.36
  6. Step 6: Final answer
    x = 17,707.43

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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.