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Finding the Fourth Proportional to 426,986.40, 640,479.60 and 238,029.60

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Solution

The fourth proportional to 426,986.40, 640,479.60 and 238,029.60 is: 357,044.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,986.40 : 640,479.60 = 238,029.60 : x
  2. Step 2: Convert to fraction form
    426,986.40/640,479.60 = 238,029.60/x
  3. Step 3: Cross multiply
    426,986.40x = 640,479.60 × 238,029.60
  4. Step 4: Simplify right side
    426,986.40x = 152,453,102,996.16
  5. Step 5: Solve for x
    x = 152,453,102,996.16/426,986.40
  6. Step 6: Final answer
    x = 357,044.40

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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.