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Finding the Fourth Proportional to 390,874.60, 587,564.70 and 363,140.20

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Solution

The fourth proportional to 390,874.60, 587,564.70 and 363,140.20 is: 545,874.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,874.60 : 587,564.70 = 363,140.20 : x
  2. Step 2: Convert to fraction form
    390,874.60/587,564.70 = 363,140.20/x
  3. Step 3: Cross multiply
    390,874.60x = 587,564.70 × 363,140.20
  4. Step 4: Simplify right side
    390,874.60x = 213,368,362,670.94
  5. Step 5: Solve for x
    x = 213,368,362,670.94/390,874.60
  6. Step 6: Final answer
    x = 545,874.21

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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.