Home / 15,320.78-21,142.20-8,607.14

Finding the Fourth Proportional to 15,320.78, 21,142.20 and 8,607.14

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Solution

The fourth proportional to 15,320.78, 21,142.20 and 8,607.14 is: 11,877.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,320.78 : 21,142.20 = 8,607.14 : x
  2. Step 2: Convert to fraction form
    15,320.78/21,142.20 = 8,607.14/x
  3. Step 3: Cross multiply
    15,320.78x = 21,142.20 × 8,607.14
  4. Step 4: Simplify right side
    15,320.78x = 181,973,875.31
  5. Step 5: Solve for x
    x = 181,973,875.31/15,320.78
  6. Step 6: Final answer
    x = 11,877.59

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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.