Home / 15,389.79-21,208.90-11,133.62

Finding the Fourth Proportional to 15,389.79, 21,208.90 and 11,133.62

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Solution

The fourth proportional to 15,389.79, 21,208.90 and 11,133.62 is: 15,343.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,389.79 : 21,208.90 = 11,133.62 : x
  2. Step 2: Convert to fraction form
    15,389.79/21,208.90 = 11,133.62/x
  3. Step 3: Cross multiply
    15,389.79x = 21,208.90 × 11,133.62
  4. Step 4: Simplify right side
    15,389.79x = 236,131,727.17
  5. Step 5: Solve for x
    x = 236,131,727.17/15,389.79
  6. Step 6: Final answer
    x = 15,343.40

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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.