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Finding the Fourth Proportional to 402,139.30, 603,208.56 and 102,619.88

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Solution

The fourth proportional to 402,139.30, 603,208.56 and 102,619.88 is: 153,929.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,139.30 : 603,208.56 = 102,619.88 : x
  2. Step 2: Convert to fraction form
    402,139.30/603,208.56 = 102,619.88/x
  3. Step 3: Cross multiply
    402,139.30x = 603,208.56 × 102,619.88
  4. Step 4: Simplify right side
    402,139.30x = 61,901,190,042.17
  5. Step 5: Solve for x
    x = 61,901,190,042.17/402,139.30
  6. Step 6: Final answer
    x = 153,929.72

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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.