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Finding the Fourth Proportional to 372,408, 513,918.72 and 202,639.20

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Solution

The fourth proportional to 372,408, 513,918.72 and 202,639.20 is: 279,639.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    372,408 : 513,918.72 = 202,639.20 : x
  2. Step 2: Convert to fraction form
    372,408/513,918.72 = 202,639.20/x
  3. Step 3: Cross multiply
    372,408x = 513,918.72 × 202,639.20
  4. Step 4: Simplify right side
    372,408x = 104,140,078,285.82
  5. Step 5: Solve for x
    x = 104,140,078,285.82/372,408
  6. Step 6: Final answer
    x = 279,639.75

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.