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Finding the Fourth Proportional to 820,687.90, 1,228,079.40 and 554,967.40

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Solution

The fourth proportional to 820,687.90, 1,228,079.40 and 554,967.40 is: 830,454.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,687.90 : 1,228,079.40 = 554,967.40 : x
  2. Step 2: Convert to fraction form
    820,687.90/1,228,079.40 = 554,967.40/x
  3. Step 3: Cross multiply
    820,687.90x = 1,228,079.40 × 554,967.40
  4. Step 4: Simplify right side
    820,687.90x = 681,544,031,611.56
  5. Step 5: Solve for x
    x = 681,544,031,611.56/820,687.90
  6. Step 6: Final answer
    x = 830,454.59

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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.