Home / 20,685.90-31,018.10-10,151.30

Finding the Fourth Proportional to 20,685.90, 31,018.10 and 10,151.30

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Solution

The fourth proportional to 20,685.90, 31,018.10 and 10,151.30 is: 15,221.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,685.90 : 31,018.10 = 10,151.30 : x
  2. Step 2: Convert to fraction form
    20,685.90/31,018.10 = 10,151.30/x
  3. Step 3: Cross multiply
    20,685.90x = 31,018.10 × 10,151.30
  4. Step 4: Simplify right side
    20,685.90x = 314,874,038.53
  5. Step 5: Solve for x
    x = 314,874,038.53/20,685.90
  6. Step 6: Final answer
    x = 15,221.67

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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.