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Finding the Fourth Proportional to 390,070.60, 584,231.10 and 320,086.60

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Solution

The fourth proportional to 390,070.60, 584,231.10 and 320,086.60 is: 479,412.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,070.60 : 584,231.10 = 320,086.60 : x
  2. Step 2: Convert to fraction form
    390,070.60/584,231.10 = 320,086.60/x
  3. Step 3: Cross multiply
    390,070.60x = 584,231.10 × 320,086.60
  4. Step 4: Simplify right side
    390,070.60x = 187,004,546,413.26
  5. Step 5: Solve for x
    x = 187,004,546,413.26/390,070.60
  6. Step 6: Final answer
    x = 479,412.05

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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.