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Finding the Fourth Proportional to 404,628.40, 607,112.70 and 217,421.20

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Solution

The fourth proportional to 404,628.40, 607,112.70 and 217,421.20 is: 326,223.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    404,628.40 : 607,112.70 = 217,421.20 : x
  2. Step 2: Convert to fraction form
    404,628.40/607,112.70 = 217,421.20/x
  3. Step 3: Cross multiply
    404,628.40x = 607,112.70 × 217,421.20
  4. Step 4: Simplify right side
    404,628.40x = 131,999,171,769.24
  5. Step 5: Solve for x
    x = 131,999,171,769.24/404,628.40
  6. Step 6: Final answer
    x = 326,223.20

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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.