Home / 15,155.40-20,918.34-13,580.76

Finding the Fourth Proportional to 15,155.40, 20,918.34 and 13,580.76

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Solution

The fourth proportional to 15,155.40, 20,918.34 and 13,580.76 is: 18,744.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,155.40 : 20,918.34 = 13,580.76 : x
  2. Step 2: Convert to fraction form
    15,155.40/20,918.34 = 13,580.76/x
  3. Step 3: Cross multiply
    15,155.40x = 20,918.34 × 13,580.76
  4. Step 4: Simplify right side
    15,155.40x = 284,086,955.14
  5. Step 5: Solve for x
    x = 284,086,955.14/15,155.40
  6. Step 6: Final answer
    x = 18,744.93

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.