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Finding the Fourth Proportional to 318,958.40, 478,437.60 and 141,811.40

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Solution

The fourth proportional to 318,958.40, 478,437.60 and 141,811.40 is: 212,717.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    318,958.40 : 478,437.60 = 141,811.40 : x
  2. Step 2: Convert to fraction form
    318,958.40/478,437.60 = 141,811.40/x
  3. Step 3: Cross multiply
    318,958.40x = 478,437.60 × 141,811.40
  4. Step 4: Simplify right side
    318,958.40x = 67,847,905,868.64
  5. Step 5: Solve for x
    x = 67,847,905,868.64/318,958.40
  6. Step 6: Final answer
    x = 212,717.10

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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.