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Finding the Fourth Proportional to 612,114.30, 918,171.45 and 280,338.30

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Solution

The fourth proportional to 612,114.30, 918,171.45 and 280,338.30 is: 420,507.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,114.30 : 918,171.45 = 280,338.30 : x
  2. Step 2: Convert to fraction form
    612,114.30/918,171.45 = 280,338.30/x
  3. Step 3: Cross multiply
    612,114.30x = 918,171.45 × 280,338.30
  4. Step 4: Simplify right side
    612,114.30x = 257,398,623,401.54
  5. Step 5: Solve for x
    x = 257,398,623,401.54/612,114.30
  6. Step 6: Final answer
    x = 420,507.45

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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.