Home / 287,198.10-431,315.55-208,401.30

Finding the Fourth Proportional to 287,198.10, 431,315.55 and 208,401.30

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Solution

The fourth proportional to 287,198.10, 431,315.55 and 208,401.30 is: 312,978.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    287,198.10 : 431,315.55 = 208,401.30 : x
  2. Step 2: Convert to fraction form
    287,198.10/431,315.55 = 208,401.30/x
  3. Step 3: Cross multiply
    287,198.10x = 431,315.55 × 208,401.30
  4. Step 4: Simplify right side
    287,198.10x = 89,886,721,330.22
  5. Step 5: Solve for x
    x = 89,886,721,330.22/287,198.10
  6. Step 6: Final answer
    x = 312,978.12

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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.