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Finding the Fourth Proportional to 209,855.70, 314,860.35 and 85,209.30

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Solution

The fourth proportional to 209,855.70, 314,860.35 and 85,209.30 is: 127,845.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,855.70 : 314,860.35 = 85,209.30 : x
  2. Step 2: Convert to fraction form
    209,855.70/314,860.35 = 85,209.30/x
  3. Step 3: Cross multiply
    209,855.70x = 314,860.35 × 85,209.30
  4. Step 4: Simplify right side
    209,855.70x = 26,829,030,021.26
  5. Step 5: Solve for x
    x = 26,829,030,021.26/209,855.70
  6. Step 6: Final answer
    x = 127,845.13

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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.