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Finding the Fourth Proportional to 390,712.96, 585,113.64 and 352,847.89

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Solution

The fourth proportional to 390,712.96, 585,113.64 and 352,847.89 is: 528,408.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,712.96 : 585,113.64 = 352,847.89 : x
  2. Step 2: Convert to fraction form
    390,712.96/585,113.64 = 352,847.89/x
  3. Step 3: Cross multiply
    390,712.96x = 585,113.64 × 352,847.89
  4. Step 4: Simplify right side
    390,712.96x = 206,456,113,284.22
  5. Step 5: Solve for x
    x = 206,456,113,284.22/390,712.96
  6. Step 6: Final answer
    x = 528,408.66

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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.