Home / 20,840.78-31,261.17-9,154.30

Finding the Fourth Proportional to 20,840.78, 31,261.17 and 9,154.30

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Solution

The fourth proportional to 20,840.78, 31,261.17 and 9,154.30 is: 13,731.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,840.78 : 31,261.17 = 9,154.30 : x
  2. Step 2: Convert to fraction form
    20,840.78/31,261.17 = 9,154.30/x
  3. Step 3: Cross multiply
    20,840.78x = 31,261.17 × 9,154.30
  4. Step 4: Simplify right side
    20,840.78x = 286,174,128.53
  5. Step 5: Solve for x
    x = 286,174,128.53/20,840.78
  6. Step 6: Final answer
    x = 13,731.45

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.