Home / 21,323.12-29,431.08-12,938

Finding the Fourth Proportional to 21,323.12, 29,431.08 and 12,938

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Solution

The fourth proportional to 21,323.12, 29,431.08 and 12,938 is: 17,857.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,323.12 : 29,431.08 = 12,938 : x
  2. Step 2: Convert to fraction form
    21,323.12/29,431.08 = 12,938/x
  3. Step 3: Cross multiply
    21,323.12x = 29,431.08 × 12,938
  4. Step 4: Simplify right side
    21,323.12x = 380,779,313.04
  5. Step 5: Solve for x
    x = 380,779,313.04/21,323.12
  6. Step 6: Final answer
    x = 17,857.58

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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.