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Finding the Fourth Proportional to 658,496.80, 987,745.20 and 445,920.40

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Solution

The fourth proportional to 658,496.80, 987,745.20 and 445,920.40 is: 668,880.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,496.80 : 987,745.20 = 445,920.40 : x
  2. Step 2: Convert to fraction form
    658,496.80/987,745.20 = 445,920.40/x
  3. Step 3: Cross multiply
    658,496.80x = 987,745.20 × 445,920.40
  4. Step 4: Simplify right side
    658,496.80x = 440,455,734,682.08
  5. Step 5: Solve for x
    x = 440,455,734,682.08/658,496.80
  6. Step 6: Final answer
    x = 668,880.60

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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.