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Finding the Fourth Proportional to 671,999.40, 1,007,999.10 and 620,677.80

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Solution

The fourth proportional to 671,999.40, 1,007,999.10 and 620,677.80 is: 931,016.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    671,999.40 : 1,007,999.10 = 620,677.80 : x
  2. Step 2: Convert to fraction form
    671,999.40/1,007,999.10 = 620,677.80/x
  3. Step 3: Cross multiply
    671,999.40x = 1,007,999.10 × 620,677.80
  4. Step 4: Simplify right side
    671,999.40x = 625,642,663,789.98
  5. Step 5: Solve for x
    x = 625,642,663,789.98/671,999.40
  6. Step 6: Final answer
    x = 931,016.70

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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.