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Finding the Fourth Proportional to 3,121,985.60, 4,682,978.40 and 878,123.60

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Solution

The fourth proportional to 3,121,985.60, 4,682,978.40 and 878,123.60 is: 1,317,185.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,121,985.60 : 4,682,978.40 = 878,123.60 : x
  2. Step 2: Convert to fraction form
    3,121,985.60/4,682,978.40 = 878,123.60/x
  3. Step 3: Cross multiply
    3,121,985.60x = 4,682,978.40 × 878,123.60
  4. Step 4: Simplify right side
    3,121,985.60x = 4,112,233,851,330.24
  5. Step 5: Solve for x
    x = 4,112,233,851,330.24/3,121,985.60
  6. Step 6: Final answer
    x = 1,317,185.40

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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.