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Finding the Fourth Proportional to 612,712.80, 919,069.20 and 455,248.80

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Solution

The fourth proportional to 612,712.80, 919,069.20 and 455,248.80 is: 682,873.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,712.80 : 919,069.20 = 455,248.80 : x
  2. Step 2: Convert to fraction form
    612,712.80/919,069.20 = 455,248.80/x
  3. Step 3: Cross multiply
    612,712.80x = 919,069.20 × 455,248.80
  4. Step 4: Simplify right side
    612,712.80x = 418,405,150,416.96
  5. Step 5: Solve for x
    x = 418,405,150,416.96/612,712.80
  6. Step 6: Final answer
    x = 682,873.20

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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.