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Finding the Fourth Proportional to 720,932.36, 994,870.90 and 398,655.88

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Solution

The fourth proportional to 720,932.36, 994,870.90 and 398,655.88 is: 550,136.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    720,932.36 : 994,870.90 = 398,655.88 : x
  2. Step 2: Convert to fraction form
    720,932.36/994,870.90 = 398,655.88/x
  3. Step 3: Cross multiply
    720,932.36x = 994,870.90 × 398,655.88
  4. Step 4: Simplify right side
    720,932.36x = 396,611,134,125.89
  5. Step 5: Solve for x
    x = 396,611,134,125.89/720,932.36
  6. Step 6: Final answer
    x = 550,136.40

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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.