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Finding the Fourth Proportional to 478,665.40, 717,998.10 and 390,091.90

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Solution

The fourth proportional to 478,665.40, 717,998.10 and 390,091.90 is: 585,137.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    478,665.40 : 717,998.10 = 390,091.90 : x
  2. Step 2: Convert to fraction form
    478,665.40/717,998.10 = 390,091.90/x
  3. Step 3: Cross multiply
    478,665.40x = 717,998.10 × 390,091.90
  4. Step 4: Simplify right side
    478,665.40x = 280,085,243,025.39
  5. Step 5: Solve for x
    x = 280,085,243,025.39/478,665.40
  6. Step 6: Final answer
    x = 585,137.85

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Similar ratio
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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.