Home / 20,711.16-31,066.74-5,128.77

Finding the Fourth Proportional to 20,711.16, 31,066.74 and 5,128.77

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Solution

The fourth proportional to 20,711.16, 31,066.74 and 5,128.77 is: 7,693.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.16 : 31,066.74 = 5,128.77 : x
  2. Step 2: Convert to fraction form
    20,711.16/31,066.74 = 5,128.77/x
  3. Step 3: Cross multiply
    20,711.16x = 31,066.74 × 5,128.77
  4. Step 4: Simplify right side
    20,711.16x = 159,334,164.11
  5. Step 5: Solve for x
    x = 159,334,164.11/20,711.16
  6. Step 6: Final answer
    x = 7,693.16

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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.