Home / 21,439.30-29,587.80-12,943.51

Finding the Fourth Proportional to 21,439.30, 29,587.80 and 12,943.51

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Solution

The fourth proportional to 21,439.30, 29,587.80 and 12,943.51 is: 17,862.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,439.30 : 29,587.80 = 12,943.51 : x
  2. Step 2: Convert to fraction form
    21,439.30/29,587.80 = 12,943.51/x
  3. Step 3: Cross multiply
    21,439.30x = 29,587.80 × 12,943.51
  4. Step 4: Simplify right side
    21,439.30x = 382,969,985.18
  5. Step 5: Solve for x
    x = 382,969,985.18/21,439.30
  6. Step 6: Final answer
    x = 17,862.99

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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.