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Finding the Fourth Proportional to 665,772.40, 998,075.40 and 399,638.80

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Solution

The fourth proportional to 665,772.40, 998,075.40 and 399,638.80 is: 599,108.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,772.40 : 998,075.40 = 399,638.80 : x
  2. Step 2: Convert to fraction form
    665,772.40/998,075.40 = 399,638.80/x
  3. Step 3: Cross multiply
    665,772.40x = 998,075.40 × 399,638.80
  4. Step 4: Simplify right side
    665,772.40x = 398,869,655,165.52
  5. Step 5: Solve for x
    x = 398,869,655,165.52/665,772.40
  6. Step 6: Final answer
    x = 599,108.13

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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.