Home / 20,865.70-31,302.48-8,386.72

Finding the Fourth Proportional to 20,865.70, 31,302.48 and 8,386.72

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Solution

The fourth proportional to 20,865.70, 31,302.48 and 8,386.72 is: 12,581.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,865.70 : 31,302.48 = 8,386.72 : x
  2. Step 2: Convert to fraction form
    20,865.70/31,302.48 = 8,386.72/x
  3. Step 3: Cross multiply
    20,865.70x = 31,302.48 × 8,386.72
  4. Step 4: Simplify right side
    20,865.70x = 262,525,135.07
  5. Step 5: Solve for x
    x = 262,525,135.07/20,865.70
  6. Step 6: Final answer
    x = 12,581.66

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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.