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Finding the Fourth Proportional to 209,931.98, 314,885 and 85,269.74

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Solution

The fourth proportional to 209,931.98, 314,885 and 85,269.74 is: 127,899.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,931.98 : 314,885 = 85,269.74 : x
  2. Step 2: Convert to fraction form
    209,931.98/314,885 = 85,269.74/x
  3. Step 3: Cross multiply
    209,931.98x = 314,885 × 85,269.74
  4. Step 4: Simplify right side
    209,931.98x = 26,850,162,079.90
  5. Step 5: Solve for x
    x = 26,850,162,079.90/209,931.98
  6. Step 6: Final answer
    x = 127,899.34

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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.