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Finding the Fourth Proportional to 209,987.80, 314,981.70 and 205,613.80

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Solution

The fourth proportional to 209,987.80, 314,981.70 and 205,613.80 is: 308,420.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    209,987.80 : 314,981.70 = 205,613.80 : x
  2. Step 2: Convert to fraction form
    209,987.80/314,981.70 = 205,613.80/x
  3. Step 3: Cross multiply
    209,987.80x = 314,981.70 × 205,613.80
  4. Step 4: Simplify right side
    209,987.80x = 64,764,584,267.46
  5. Step 5: Solve for x
    x = 64,764,584,267.46/209,987.80
  6. Step 6: Final answer
    x = 308,420.70

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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.