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Finding the Fourth Proportional to 665,638.60, 997,801.80 and 328,403.20

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Solution

The fourth proportional to 665,638.60, 997,801.80 and 328,403.20 is: 492,281.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,638.60 : 997,801.80 = 328,403.20 : x
  2. Step 2: Convert to fraction form
    665,638.60/997,801.80 = 328,403.20/x
  3. Step 3: Cross multiply
    665,638.60x = 997,801.80 × 328,403.20
  4. Step 4: Simplify right side
    665,638.60x = 327,681,304,085.76
  5. Step 5: Solve for x
    x = 327,681,304,085.76/665,638.60
  6. Step 6: Final answer
    x = 492,281.10

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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.