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Finding the Fourth Proportional to 539,938.10, 809,907.15 and 390,638.90

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Solution

The fourth proportional to 539,938.10, 809,907.15 and 390,638.90 is: 585,958.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    539,938.10 : 809,907.15 = 390,638.90 : x
  2. Step 2: Convert to fraction form
    539,938.10/809,907.15 = 390,638.90/x
  3. Step 3: Cross multiply
    539,938.10x = 809,907.15 × 390,638.90
  4. Step 4: Simplify right side
    539,938.10x = 316,381,238,178.14
  5. Step 5: Solve for x
    x = 316,381,238,178.14/539,938.10
  6. Step 6: Final answer
    x = 585,958.35

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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.