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Finding the Fourth Proportional to 579,316.80, 868,975.20 and 420,801.60

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Solution

The fourth proportional to 579,316.80, 868,975.20 and 420,801.60 is: 631,202.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    579,316.80 : 868,975.20 = 420,801.60 : x
  2. Step 2: Convert to fraction form
    579,316.80/868,975.20 = 420,801.60/x
  3. Step 3: Cross multiply
    579,316.80x = 868,975.20 × 420,801.60
  4. Step 4: Simplify right side
    579,316.80x = 365,666,154,520.32
  5. Step 5: Solve for x
    x = 365,666,154,520.32/579,316.80
  6. Step 6: Final answer
    x = 631,202.40

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Similar ratio
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1.5x scale

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.