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Finding the Fourth Proportional to 520,140.80, 780,211.20 and 270,790.40

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Solution

The fourth proportional to 520,140.80, 780,211.20 and 270,790.40 is: 406,185.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    520,140.80 : 780,211.20 = 270,790.40 : x
  2. Step 2: Convert to fraction form
    520,140.80/780,211.20 = 270,790.40/x
  3. Step 3: Cross multiply
    520,140.80x = 780,211.20 × 270,790.40
  4. Step 4: Simplify right side
    520,140.80x = 211,273,702,932.48
  5. Step 5: Solve for x
    x = 211,273,702,932.48/520,140.80
  6. Step 6: Final answer
    x = 406,185.60

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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.