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Finding the Fourth Proportional to 661,825,761.80, 992,738,642.70 and 439,896,000.20

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Solution

The fourth proportional to 661,825,761.80, 992,738,642.70 and 439,896,000.20 is: 659,844,000.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,825,761.80 : 992,738,642.70 = 439,896,000.20 : x
  2. Step 2: Convert to fraction form
    661,825,761.80/992,738,642.70 = 439,896,000.20/x
  3. Step 3: Cross multiply
    661,825,761.80x = 992,738,642.70 × 439,896,000.20
  4. Step 4: Simplify right side
    661,825,761.80x = 436,701,758,167,706,944
  5. Step 5: Solve for x
    x = 436,701,758,167,706,944/661,825,761.80
  6. Step 6: Final answer
    x = 659,844,000.30

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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.