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Finding the Fourth Proportional to 485,999.70, 728,999.55 and 385,616.40

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Solution

The fourth proportional to 485,999.70, 728,999.55 and 385,616.40 is: 578,424.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,999.70 : 728,999.55 = 385,616.40 : x
  2. Step 2: Convert to fraction form
    485,999.70/728,999.55 = 385,616.40/x
  3. Step 3: Cross multiply
    485,999.70x = 728,999.55 × 385,616.40
  4. Step 4: Simplify right side
    485,999.70x = 281,114,182,072.62
  5. Step 5: Solve for x
    x = 281,114,182,072.62/485,999.70
  6. Step 6: Final answer
    x = 578,424.60

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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.