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Finding the Fourth Proportional to 717,611.76, 991,311.48 and 679,820.40

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Solution

The fourth proportional to 717,611.76, 991,311.48 and 679,820.40 is: 939,106.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    717,611.76 : 991,311.48 = 679,820.40 : x
  2. Step 2: Convert to fraction form
    717,611.76/991,311.48 = 679,820.40/x
  3. Step 3: Cross multiply
    717,611.76x = 991,311.48 × 679,820.40
  4. Step 4: Simplify right side
    717,611.76x = 673,913,766,858.19
  5. Step 5: Solve for x
    x = 673,913,766,858.19/717,611.76
  6. Step 6: Final answer
    x = 939,106.36

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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.