Home / 13,430.90-20,155.10-5,110.99

Finding the Fourth Proportional to 13,430.90, 20,155.10 and 5,110.99

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Solution

The fourth proportional to 13,430.90, 20,155.10 and 5,110.99 is: 7,669.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,430.90 : 20,155.10 = 5,110.99 : x
  2. Step 2: Convert to fraction form
    13,430.90/20,155.10 = 5,110.99/x
  3. Step 3: Cross multiply
    13,430.90x = 20,155.10 × 5,110.99
  4. Step 4: Simplify right side
    13,430.90x = 103,012,476.94
  5. Step 5: Solve for x
    x = 103,012,476.94/13,430.90
  6. Step 6: Final answer
    x = 7,669.81

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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.