Home / 20,870.64-31,307.40-7,722.72

Finding the Fourth Proportional to 20,870.64, 31,307.40 and 7,722.72

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Solution

The fourth proportional to 20,870.64, 31,307.40 and 7,722.72 is: 11,584.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,870.64 : 31,307.40 = 7,722.72 : x
  2. Step 2: Convert to fraction form
    20,870.64/31,307.40 = 7,722.72/x
  3. Step 3: Cross multiply
    20,870.64x = 31,307.40 × 7,722.72
  4. Step 4: Simplify right side
    20,870.64x = 241,778,284.13
  5. Step 5: Solve for x
    x = 241,778,284.13/20,870.64
  6. Step 6: Final answer
    x = 11,584.61

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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.