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Finding the Fourth Proportional to 721,808.64, 996,197.76 and 420,099.84

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Solution

The fourth proportional to 721,808.64, 996,197.76 and 420,099.84 is: 579,797.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    721,808.64 : 996,197.76 = 420,099.84 : x
  2. Step 2: Convert to fraction form
    721,808.64/996,197.76 = 420,099.84/x
  3. Step 3: Cross multiply
    721,808.64x = 996,197.76 × 420,099.84
  4. Step 4: Simplify right side
    721,808.64x = 418,502,519,584.36
  5. Step 5: Solve for x
    x = 418,502,519,584.36/721,808.64
  6. Step 6: Final answer
    x = 579,797.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.