Home / 21,418.32-31,981.71-18,898.50

Finding the Fourth Proportional to 21,418.32, 31,981.71 and 18,898.50

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Solution

The fourth proportional to 21,418.32, 31,981.71 and 18,898.50 is: 28,219.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,418.32 : 31,981.71 = 18,898.50 : x
  2. Step 2: Convert to fraction form
    21,418.32/31,981.71 = 18,898.50/x
  3. Step 3: Cross multiply
    21,418.32x = 31,981.71 × 18,898.50
  4. Step 4: Simplify right side
    21,418.32x = 604,406,346.44
  5. Step 5: Solve for x
    x = 604,406,346.44/21,418.32
  6. Step 6: Final answer
    x = 28,219.13

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.