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Finding the Fourth Proportional to 621,320.19, 931,978.71 and 172,039.56

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Solution

The fourth proportional to 621,320.19, 931,978.71 and 172,039.56 is: 258,058.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,320.19 : 931,978.71 = 172,039.56 : x
  2. Step 2: Convert to fraction form
    621,320.19/931,978.71 = 172,039.56/x
  3. Step 3: Cross multiply
    621,320.19x = 931,978.71 × 172,039.56
  4. Step 4: Simplify right side
    621,320.19x = 160,337,202,537.87
  5. Step 5: Solve for x
    x = 160,337,202,537.87/621,320.19
  6. Step 6: Final answer
    x = 258,058.90

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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.