Home / 20,905.79-31,358.55-5,110.93

Finding the Fourth Proportional to 20,905.79, 31,358.55 and 5,110.93

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Solution

The fourth proportional to 20,905.79, 31,358.55 and 5,110.93 is: 7,666.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,905.79 : 31,358.55 = 5,110.93 : x
  2. Step 2: Convert to fraction form
    20,905.79/31,358.55 = 5,110.93/x
  3. Step 3: Cross multiply
    20,905.79x = 31,358.55 × 5,110.93
  4. Step 4: Simplify right side
    20,905.79x = 160,271,353.95
  5. Step 5: Solve for x
    x = 160,271,353.95/20,905.79
  6. Step 6: Final answer
    x = 7,666.36

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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.