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Finding the Fourth Proportional to 390,078.60, 585,117.90 and 319,219.80

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Solution

The fourth proportional to 390,078.60, 585,117.90 and 319,219.80 is: 478,829.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,078.60 : 585,117.90 = 319,219.80 : x
  2. Step 2: Convert to fraction form
    390,078.60/585,117.90 = 319,219.80/x
  3. Step 3: Cross multiply
    390,078.60x = 585,117.90 × 319,219.80
  4. Step 4: Simplify right side
    390,078.60x = 186,781,219,014.42
  5. Step 5: Solve for x
    x = 186,781,219,014.42/390,078.60
  6. Step 6: Final answer
    x = 478,829.70

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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.