Home / 28,931.85-39,930.21-18,322.47

Finding the Fourth Proportional to 28,931.85, 39,930.21 and 18,322.47

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Solution

The fourth proportional to 28,931.85, 39,930.21 and 18,322.47 is: 25,287.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,931.85 : 39,930.21 = 18,322.47 : x
  2. Step 2: Convert to fraction form
    28,931.85/39,930.21 = 18,322.47/x
  3. Step 3: Cross multiply
    28,931.85x = 39,930.21 × 18,322.47
  4. Step 4: Simplify right side
    28,931.85x = 731,620,074.82
  5. Step 5: Solve for x
    x = 731,620,074.82/28,931.85
  6. Step 6: Final answer
    x = 25,287.70

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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.