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Finding the Fourth Proportional to 438,638.80, 657,245.40 and 396,648.40

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Solution

The fourth proportional to 438,638.80, 657,245.40 and 396,648.40 is: 594,328.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,638.80 : 657,245.40 = 396,648.40 : x
  2. Step 2: Convert to fraction form
    438,638.80/657,245.40 = 396,648.40/x
  3. Step 3: Cross multiply
    438,638.80x = 657,245.40 × 396,648.40
  4. Step 4: Simplify right side
    438,638.80x = 260,695,336,317.36
  5. Step 5: Solve for x
    x = 260,695,336,317.36/438,638.80
  6. Step 6: Final answer
    x = 594,328.04

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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.