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Finding the Fourth Proportional to 612,212.20, 918,318.30 and 442,938.40

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Solution

The fourth proportional to 612,212.20, 918,318.30 and 442,938.40 is: 664,407.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,212.20 : 918,318.30 = 442,938.40 : x
  2. Step 2: Convert to fraction form
    612,212.20/918,318.30 = 442,938.40/x
  3. Step 3: Cross multiply
    612,212.20x = 918,318.30 × 442,938.40
  4. Step 4: Simplify right side
    612,212.20x = 406,758,438,492.72
  5. Step 5: Solve for x
    x = 406,758,438,492.72/612,212.20
  6. Step 6: Final answer
    x = 664,407.60

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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.