Home / 38,490-53,116.68-21,723.12

Finding the Fourth Proportional to 38,490, 53,116.68 and 21,723.12

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Solution

The fourth proportional to 38,490, 53,116.68 and 21,723.12 is: 29,978.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    38,490 : 53,116.68 = 21,723.12 : x
  2. Step 2: Convert to fraction form
    38,490/53,116.68 = 21,723.12/x
  3. Step 3: Cross multiply
    38,490x = 53,116.68 × 21,723.12
  4. Step 4: Simplify right side
    38,490x = 1,153,860,013.64
  5. Step 5: Solve for x
    x = 1,153,860,013.64/38,490
  6. Step 6: Final answer
    x = 29,978.18

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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.