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Finding the Fourth Proportional to 612,133.20, 918,199.80 and 442,859.40

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Solution

The fourth proportional to 612,133.20, 918,199.80 and 442,859.40 is: 664,289.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,133.20 : 918,199.80 = 442,859.40 : x
  2. Step 2: Convert to fraction form
    612,133.20/918,199.80 = 442,859.40/x
  3. Step 3: Cross multiply
    612,133.20x = 918,199.80 × 442,859.40
  4. Step 4: Simplify right side
    612,133.20x = 406,633,412,508.12
  5. Step 5: Solve for x
    x = 406,633,412,508.12/612,133.20
  6. Step 6: Final answer
    x = 664,289.10

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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.