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Finding the Fourth Proportional to 659,620.80, 989,431.20 and 447,044.40

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Solution

The fourth proportional to 659,620.80, 989,431.20 and 447,044.40 is: 670,566.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    659,620.80 : 989,431.20 = 447,044.40 : x
  2. Step 2: Convert to fraction form
    659,620.80/989,431.20 = 447,044.40/x
  3. Step 3: Cross multiply
    659,620.80x = 989,431.20 × 447,044.40
  4. Step 4: Simplify right side
    659,620.80x = 442,319,677,145.28
  5. Step 5: Solve for x
    x = 442,319,677,145.28/659,620.80
  6. Step 6: Final answer
    x = 670,566.60

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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.