Home / 21,420.12-29,559.54-11,988.75

Finding the Fourth Proportional to 21,420.12, 29,559.54 and 11,988.75

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Solution

The fourth proportional to 21,420.12, 29,559.54 and 11,988.75 is: 16,544.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,420.12 : 29,559.54 = 11,988.75 : x
  2. Step 2: Convert to fraction form
    21,420.12/29,559.54 = 11,988.75/x
  3. Step 3: Cross multiply
    21,420.12x = 29,559.54 × 11,988.75
  4. Step 4: Simplify right side
    21,420.12x = 354,381,935.18
  5. Step 5: Solve for x
    x = 354,381,935.18/21,420.12
  6. Step 6: Final answer
    x = 16,544.35

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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.