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Finding the Fourth Proportional to 612,603.70, 918,905.55 and 443,329.90

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Solution

The fourth proportional to 612,603.70, 918,905.55 and 443,329.90 is: 664,994.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,603.70 : 918,905.55 = 443,329.90 : x
  2. Step 2: Convert to fraction form
    612,603.70/918,905.55 = 443,329.90/x
  3. Step 3: Cross multiply
    612,603.70x = 918,905.55 × 443,329.90
  4. Step 4: Simplify right side
    612,603.70x = 407,378,305,590.95
  5. Step 5: Solve for x
    x = 407,378,305,590.95/612,603.70
  6. Step 6: Final answer
    x = 664,994.85

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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.