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Finding the Fourth Proportional to 297,121.76, 445,638.80 and 86,703.20

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Solution

The fourth proportional to 297,121.76, 445,638.80 and 86,703.20 is: 130,042.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    297,121.76 : 445,638.80 = 86,703.20 : x
  2. Step 2: Convert to fraction form
    297,121.76/445,638.80 = 86,703.20/x
  3. Step 3: Cross multiply
    297,121.76x = 445,638.80 × 86,703.20
  4. Step 4: Simplify right side
    297,121.76x = 38,638,310,004.16
  5. Step 5: Solve for x
    x = 38,638,310,004.16/297,121.76
  6. Step 6: Final answer
    x = 130,042.01

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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.