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Finding the Fourth Proportional to 612,469.40, 918,704.10 and 455,005.40

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Solution

The fourth proportional to 612,469.40, 918,704.10 and 455,005.40 is: 682,508.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,469.40 : 918,704.10 = 455,005.40 : x
  2. Step 2: Convert to fraction form
    612,469.40/918,704.10 = 455,005.40/x
  3. Step 3: Cross multiply
    612,469.40x = 918,704.10 × 455,005.40
  4. Step 4: Simplify right side
    612,469.40x = 418,015,326,502.14
  5. Step 5: Solve for x
    x = 418,015,326,502.14/612,469.40
  6. Step 6: Final answer
    x = 682,508.10

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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.