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Finding the Fourth Proportional to 1,118,971.80, 1,676,489.40 and 918,205.20

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Solution

The fourth proportional to 1,118,971.80, 1,676,489.40 and 918,205.20 is: 1,375,692.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,118,971.80 : 1,676,489.40 = 918,205.20 : x
  2. Step 2: Convert to fraction form
    1,118,971.80/1,676,489.40 = 918,205.20/x
  3. Step 3: Cross multiply
    1,118,971.80x = 1,676,489.40 × 918,205.20
  4. Step 4: Simplify right side
    1,118,971.80x = 1,539,361,284,824.88
  5. Step 5: Solve for x
    x = 1,539,361,284,824.88/1,118,971.80
  6. Step 6: Final answer
    x = 1,375,692.65

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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.