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Finding the Fourth Proportional to 339,921.10, 509,881.65 and 318,925.90

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Solution

The fourth proportional to 339,921.10, 509,881.65 and 318,925.90 is: 478,388.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    339,921.10 : 509,881.65 = 318,925.90 : x
  2. Step 2: Convert to fraction form
    339,921.10/509,881.65 = 318,925.90/x
  3. Step 3: Cross multiply
    339,921.10x = 509,881.65 × 318,925.90
  4. Step 4: Simplify right side
    339,921.10x = 162,614,464,119.74
  5. Step 5: Solve for x
    x = 162,614,464,119.74/339,921.10
  6. Step 6: Final answer
    x = 478,388.85

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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.