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Finding the Fourth Proportional to 163,860.20, 245,798.40 and 85,128.20

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Solution

The fourth proportional to 163,860.20, 245,798.40 and 85,128.20 is: 127,696.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    163,860.20 : 245,798.40 = 85,128.20 : x
  2. Step 2: Convert to fraction form
    163,860.20/245,798.40 = 85,128.20/x
  3. Step 3: Cross multiply
    163,860.20x = 245,798.40 × 85,128.20
  4. Step 4: Simplify right side
    163,860.20x = 20,924,375,354.88
  5. Step 5: Solve for x
    x = 20,924,375,354.88/163,860.20
  6. Step 6: Final answer
    x = 127,696.51

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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.