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Finding the Fourth Proportional to 385,408.80, 578,113.20 and 362,080.80

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Solution

The fourth proportional to 385,408.80, 578,113.20 and 362,080.80 is: 543,121.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,408.80 : 578,113.20 = 362,080.80 : x
  2. Step 2: Convert to fraction form
    385,408.80/578,113.20 = 362,080.80/x
  3. Step 3: Cross multiply
    385,408.80x = 578,113.20 × 362,080.80
  4. Step 4: Simplify right side
    385,408.80x = 209,323,689,946.56
  5. Step 5: Solve for x
    x = 209,323,689,946.56/385,408.80
  6. Step 6: Final answer
    x = 543,121.20

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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.