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Finding the Fourth Proportional to 390,089.21, 585,245.90 and 162,340.50

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Solution

The fourth proportional to 390,089.21, 585,245.90 and 162,340.50 is: 243,557.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,089.21 : 585,245.90 = 162,340.50 : x
  2. Step 2: Convert to fraction form
    390,089.21/585,245.90 = 162,340.50/x
  3. Step 3: Cross multiply
    390,089.21x = 585,245.90 × 162,340.50
  4. Step 4: Simplify right side
    390,089.21x = 95,009,112,028.95
  5. Step 5: Solve for x
    x = 95,009,112,028.95/390,089.21
  6. Step 6: Final answer
    x = 243,557.40

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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.