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Finding the Fourth Proportional to 665,750.40, 998,042.40 and 399,616.80

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Solution

The fourth proportional to 665,750.40, 998,042.40 and 399,616.80 is: 599,075.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,750.40 : 998,042.40 = 399,616.80 : x
  2. Step 2: Convert to fraction form
    665,750.40/998,042.40 = 399,616.80/x
  3. Step 3: Cross multiply
    665,750.40x = 998,042.40 × 399,616.80
  4. Step 4: Simplify right side
    665,750.40x = 398,834,510,152.32
  5. Step 5: Solve for x
    x = 398,834,510,152.32/665,750.40
  6. Step 6: Final answer
    x = 599,075.13

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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.