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Finding the Fourth Proportional to 389,988.12, 585,017.88 and 109,503.48

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Solution

The fourth proportional to 389,988.12, 585,017.88 and 109,503.48 is: 164,265.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    389,988.12 : 585,017.88 = 109,503.48 : x
  2. Step 2: Convert to fraction form
    389,988.12/585,017.88 = 109,503.48/x
  3. Step 3: Cross multiply
    389,988.12x = 585,017.88 × 109,503.48
  4. Step 4: Simplify right side
    389,988.12x = 64,061,493,722.22
  5. Step 5: Solve for x
    x = 64,061,493,722.22/389,988.12
  6. Step 6: Final answer
    x = 164,265.24

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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.