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Finding the Fourth Proportional to 426,643.20, 639,043.20 and 352,915.20

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Solution

The fourth proportional to 426,643.20, 639,043.20 and 352,915.20 is: 528,610.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,643.20 : 639,043.20 = 352,915.20 : x
  2. Step 2: Convert to fraction form
    426,643.20/639,043.20 = 352,915.20/x
  3. Step 3: Cross multiply
    426,643.20x = 639,043.20 × 352,915.20
  4. Step 4: Simplify right side
    426,643.20x = 225,528,058,736.64
  5. Step 5: Solve for x
    x = 225,528,058,736.64/426,643.20
  6. Step 6: Final answer
    x = 528,610.46

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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.