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Finding the Fourth Proportional to 548,142.40, 821,330.40 and 310,779.20

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Solution

The fourth proportional to 548,142.40, 821,330.40 and 310,779.20 is: 465,668.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    548,142.40 : 821,330.40 = 310,779.20 : x
  2. Step 2: Convert to fraction form
    548,142.40/821,330.40 = 310,779.20/x
  3. Step 3: Cross multiply
    548,142.40x = 821,330.40 × 310,779.20
  4. Step 4: Simplify right side
    548,142.40x = 255,252,404,647.68
  5. Step 5: Solve for x
    x = 255,252,404,647.68/548,142.40
  6. Step 6: Final answer
    x = 465,668.05

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Similar ratio
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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.