Home / 21,154.31-29,172.81-12,655.09

Finding the Fourth Proportional to 21,154.31, 29,172.81 and 12,655.09

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Solution

The fourth proportional to 21,154.31, 29,172.81 and 12,655.09 is: 17,451.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,154.31 : 29,172.81 = 12,655.09 : x
  2. Step 2: Convert to fraction form
    21,154.31/29,172.81 = 12,655.09/x
  3. Step 3: Cross multiply
    21,154.31x = 29,172.81 × 12,655.09
  4. Step 4: Simplify right side
    21,154.31x = 369,184,384.74
  5. Step 5: Solve for x
    x = 369,184,384.74/21,154.31
  6. Step 6: Final answer
    x = 17,451.97

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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.