Home / 20,931.37-28,892.88-13,860.07

Finding the Fourth Proportional to 20,931.37, 28,892.88 and 13,860.07

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Solution

The fourth proportional to 20,931.37, 28,892.88 and 13,860.07 is: 19,131.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,931.37 : 28,892.88 = 13,860.07 : x
  2. Step 2: Convert to fraction form
    20,931.37/28,892.88 = 13,860.07/x
  3. Step 3: Cross multiply
    20,931.37x = 28,892.88 × 13,860.07
  4. Step 4: Simplify right side
    20,931.37x = 400,457,267.07
  5. Step 5: Solve for x
    x = 400,457,267.07/20,931.37
  6. Step 6: Final answer
    x = 19,131.92

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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.