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Finding the Fourth Proportional to 578,416.20, 868,661.10 and 420,822.60

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Solution

The fourth proportional to 578,416.20, 868,661.10 and 420,822.60 is: 631,988.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    578,416.20 : 868,661.10 = 420,822.60 : x
  2. Step 2: Convert to fraction form
    578,416.20/868,661.10 = 420,822.60/x
  3. Step 3: Cross multiply
    578,416.20x = 868,661.10 × 420,822.60
  4. Step 4: Simplify right side
    578,416.20x = 365,552,222,620.86
  5. Step 5: Solve for x
    x = 365,552,222,620.86/578,416.20
  6. Step 6: Final answer
    x = 631,988.22

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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.