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Finding the Fourth Proportional to 539,386.80, 809,080.20 and 339,932.40

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Solution

The fourth proportional to 539,386.80, 809,080.20 and 339,932.40 is: 509,898.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,386.80 : 809,080.20 = 339,932.40 : x
  2. Step 2: Convert to fraction form
    539,386.80/809,080.20 = 339,932.40/x
  3. Step 3: Cross multiply
    539,386.80x = 809,080.20 × 339,932.40
  4. Step 4: Simplify right side
    539,386.80x = 275,032,574,178.48
  5. Step 5: Solve for x
    x = 275,032,574,178.48/539,386.80
  6. Step 6: Final answer
    x = 509,898.60

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Double scale
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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.