Home / 20,782.61-31,178.60-6,931.25

Finding the Fourth Proportional to 20,782.61, 31,178.60 and 6,931.25

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Solution

The fourth proportional to 20,782.61, 31,178.60 and 6,931.25 is: 10,398.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,782.61 : 31,178.60 = 6,931.25 : x
  2. Step 2: Convert to fraction form
    20,782.61/31,178.60 = 6,931.25/x
  3. Step 3: Cross multiply
    20,782.61x = 31,178.60 × 6,931.25
  4. Step 4: Simplify right side
    20,782.61x = 216,106,636.59
  5. Step 5: Solve for x
    x = 216,106,636.59/20,782.61
  6. Step 6: Final answer
    x = 10,398.44

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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.