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Finding the Fourth Proportional to 208,368.90, 312,699.15 and 90,125.10

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Solution

The fourth proportional to 208,368.90, 312,699.15 and 90,125.10 is: 135,250.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    208,368.90 : 312,699.15 = 90,125.10 : x
  2. Step 2: Convert to fraction form
    208,368.90/312,699.15 = 90,125.10/x
  3. Step 3: Cross multiply
    208,368.90x = 312,699.15 × 90,125.10
  4. Step 4: Simplify right side
    208,368.90x = 28,182,042,163.67
  5. Step 5: Solve for x
    x = 28,182,042,163.67/208,368.90
  6. Step 6: Final answer
    x = 135,250.71

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1.5x scale

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.