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Finding the Fourth Proportional to 390,025.20, 585,037.80 and 319,166.40

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Solution

The fourth proportional to 390,025.20, 585,037.80 and 319,166.40 is: 478,749.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,025.20 : 585,037.80 = 319,166.40 : x
  2. Step 2: Convert to fraction form
    390,025.20/585,037.80 = 319,166.40/x
  3. Step 3: Cross multiply
    390,025.20x = 585,037.80 × 319,166.40
  4. Step 4: Simplify right side
    390,025.20x = 186,724,408,489.92
  5. Step 5: Solve for x
    x = 186,724,408,489.92/390,025.20
  6. Step 6: Final answer
    x = 478,749.60

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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.