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Finding the Fourth Proportional to 259,871.60, 389,807.40 and 217,881.20

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Solution

The fourth proportional to 259,871.60, 389,807.40 and 217,881.20 is: 326,821.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    259,871.60 : 389,807.40 = 217,881.20 : x
  2. Step 2: Convert to fraction form
    259,871.60/389,807.40 = 217,881.20/x
  3. Step 3: Cross multiply
    259,871.60x = 389,807.40 × 217,881.20
  4. Step 4: Simplify right side
    259,871.60x = 84,931,704,080.88
  5. Step 5: Solve for x
    x = 84,931,704,080.88/259,871.60
  6. Step 6: Final answer
    x = 326,821.80

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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.