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Finding the Fourth Proportional to 399,276.80, 598,915.20 and 370,408.40

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Solution

The fourth proportional to 399,276.80, 598,915.20 and 370,408.40 is: 555,612.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,276.80 : 598,915.20 = 370,408.40 : x
  2. Step 2: Convert to fraction form
    399,276.80/598,915.20 = 370,408.40/x
  3. Step 3: Cross multiply
    399,276.80x = 598,915.20 × 370,408.40
  4. Step 4: Simplify right side
    399,276.80x = 221,843,220,967.68
  5. Step 5: Solve for x
    x = 221,843,220,967.68/399,276.80
  6. Step 6: Final answer
    x = 555,612.60

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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.