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Finding the Fourth Proportional to 916,540.60, 1,374,810.90 and 820,118.20

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Solution

The fourth proportional to 916,540.60, 1,374,810.90 and 820,118.20 is: 1,230,177.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    916,540.60 : 1,374,810.90 = 820,118.20 : x
  2. Step 2: Convert to fraction form
    916,540.60/1,374,810.90 = 820,118.20/x
  3. Step 3: Cross multiply
    916,540.60x = 1,374,810.90 × 820,118.20
  4. Step 4: Simplify right side
    916,540.60x = 1,127,507,440,648.38
  5. Step 5: Solve for x
    x = 1,127,507,440,648.38/916,540.60
  6. Step 6: Final answer
    x = 1,230,177.30

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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.