Home / 858,121.38-1,287,140.34-318,482.78

Finding the Fourth Proportional to 858,121.38, 1,287,140.34 and 318,482.78

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Solution

The fourth proportional to 858,121.38, 1,287,140.34 and 318,482.78 is: 477,708.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    858,121.38 : 1,287,140.34 = 318,482.78 : x
  2. Step 2: Convert to fraction form
    858,121.38/1,287,140.34 = 318,482.78/x
  3. Step 3: Cross multiply
    858,121.38x = 1,287,140.34 × 318,482.78
  4. Step 4: Simplify right side
    858,121.38x = 409,932,027,297.64
  5. Step 5: Solve for x
    x = 409,932,027,297.64/858,121.38
  6. Step 6: Final answer
    x = 477,708.67

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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.