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Finding the Fourth Proportional to 389,871.60, 584,807.40 and 386,185.20

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Solution

The fourth proportional to 389,871.60, 584,807.40 and 386,185.20 is: 579,277.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,871.60 : 584,807.40 = 386,185.20 : x
  2. Step 2: Convert to fraction form
    389,871.60/584,807.40 = 386,185.20/x
  3. Step 3: Cross multiply
    389,871.60x = 584,807.40 × 386,185.20
  4. Step 4: Simplify right side
    389,871.60x = 225,843,962,730.48
  5. Step 5: Solve for x
    x = 225,843,962,730.48/389,871.60
  6. Step 6: Final answer
    x = 579,277.80

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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.