Home / 21,721.12-29,948.88-18,358

Finding the Fourth Proportional to 21,721.12, 29,948.88 and 18,358

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Solution

The fourth proportional to 21,721.12, 29,948.88 and 18,358 is: 25,311.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,721.12 : 29,948.88 = 18,358 : x
  2. Step 2: Convert to fraction form
    21,721.12/29,948.88 = 18,358/x
  3. Step 3: Cross multiply
    21,721.12x = 29,948.88 × 18,358
  4. Step 4: Simplify right side
    21,721.12x = 549,801,539.04
  5. Step 5: Solve for x
    x = 549,801,539.04/21,721.12
  6. Step 6: Final answer
    x = 25,311.84

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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.