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Finding the Fourth Proportional to 389,485.80, 584,171.10 and 109,031.40

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Solution

The fourth proportional to 389,485.80, 584,171.10 and 109,031.40 is: 163,530.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,485.80 : 584,171.10 = 109,031.40 : x
  2. Step 2: Convert to fraction form
    389,485.80/584,171.10 = 109,031.40/x
  3. Step 3: Cross multiply
    389,485.80x = 584,171.10 × 109,031.40
  4. Step 4: Simplify right side
    389,485.80x = 63,692,992,872.54
  5. Step 5: Solve for x
    x = 63,692,992,872.54/389,485.80
  6. Step 6: Final answer
    x = 163,530.98

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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.