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Finding the Fourth Proportional to 820,138.80, 1,230,208.20 and 746,655.60

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Solution

The fourth proportional to 820,138.80, 1,230,208.20 and 746,655.60 is: 1,119,983.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    820,138.80 : 1,230,208.20 = 746,655.60 : x
  2. Step 2: Convert to fraction form
    820,138.80/1,230,208.20 = 746,655.60/x
  3. Step 3: Cross multiply
    820,138.80x = 1,230,208.20 × 746,655.60
  4. Step 4: Simplify right side
    820,138.80x = 918,541,841,695.92
  5. Step 5: Solve for x
    x = 918,541,841,695.92/820,138.80
  6. Step 6: Final answer
    x = 1,119,983.40

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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.