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Finding the Fourth Proportional to 163,810.20, 245,723.40 and 85,078.20

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Solution

The fourth proportional to 163,810.20, 245,723.40 and 85,078.20 is: 127,621.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,810.20 : 245,723.40 = 85,078.20 : x
  2. Step 2: Convert to fraction form
    163,810.20/245,723.40 = 85,078.20/x
  3. Step 3: Cross multiply
    163,810.20x = 245,723.40 × 85,078.20
  4. Step 4: Simplify right side
    163,810.20x = 20,905,704,569.88
  5. Step 5: Solve for x
    x = 20,905,704,569.88/163,810.20
  6. Step 6: Final answer
    x = 127,621.51

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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.