Home / 21,511.84-29,681.04-13,125.28

Finding the Fourth Proportional to 21,511.84, 29,681.04 and 13,125.28

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Solution

The fourth proportional to 21,511.84, 29,681.04 and 13,125.28 is: 18,109.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,511.84 : 29,681.04 = 13,125.28 : x
  2. Step 2: Convert to fraction form
    21,511.84/29,681.04 = 13,125.28/x
  3. Step 3: Cross multiply
    21,511.84x = 29,681.04 × 13,125.28
  4. Step 4: Simplify right side
    21,511.84x = 389,571,960.69
  5. Step 5: Solve for x
    x = 389,571,960.69/21,511.84
  6. Step 6: Final answer
    x = 18,109.65

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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.