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Finding the Fourth Proportional to 309,699.90, 426,933.50 and 218,895.66

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Solution

The fourth proportional to 309,699.90, 426,933.50 and 218,895.66 is: 301,756.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    309,699.90 : 426,933.50 = 218,895.66 : x
  2. Step 2: Convert to fraction form
    309,699.90/426,933.50 = 218,895.66/x
  3. Step 3: Cross multiply
    309,699.90x = 426,933.50 × 218,895.66
  4. Step 4: Simplify right side
    309,699.90x = 93,453,889,164.13
  5. Step 5: Solve for x
    x = 93,453,889,164.13/309,699.90
  6. Step 6: Final answer
    x = 301,756.28

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.