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Finding the Fourth Proportional to 385,412.20, 578,118.30 and 243,694.60

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Solution

The fourth proportional to 385,412.20, 578,118.30 and 243,694.60 is: 365,541.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,412.20 : 578,118.30 = 243,694.60 : x
  2. Step 2: Convert to fraction form
    385,412.20/578,118.30 = 243,694.60/x
  3. Step 3: Cross multiply
    385,412.20x = 578,118.30 × 243,694.60
  4. Step 4: Simplify right side
    385,412.20x = 140,884,307,871.18
  5. Step 5: Solve for x
    x = 140,884,307,871.18/385,412.20
  6. Step 6: Final answer
    x = 365,541.90

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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.