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Finding the Fourth Proportional to 658,492.80, 987,739.20 and 445,916.40

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Solution

The fourth proportional to 658,492.80, 987,739.20 and 445,916.40 is: 668,874.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    658,492.80 : 987,739.20 = 445,916.40 : x
  2. Step 2: Convert to fraction form
    658,492.80/987,739.20 = 445,916.40/x
  3. Step 3: Cross multiply
    658,492.80x = 987,739.20 × 445,916.40
  4. Step 4: Simplify right side
    658,492.80x = 440,449,108,202.88
  5. Step 5: Solve for x
    x = 440,449,108,202.88/658,492.80
  6. Step 6: Final answer
    x = 668,874.60

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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.