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Finding the Fourth Proportional to 212,486.40, 318,741.12 and 79,401.60

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Solution

The fourth proportional to 212,486.40, 318,741.12 and 79,401.60 is: 119,106.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,486.40 : 318,741.12 = 79,401.60 : x
  2. Step 2: Convert to fraction form
    212,486.40/318,741.12 = 79,401.60/x
  3. Step 3: Cross multiply
    212,486.40x = 318,741.12 × 79,401.60
  4. Step 4: Simplify right side
    212,486.40x = 25,308,554,913.79
  5. Step 5: Solve for x
    x = 25,308,554,913.79/212,486.40
  6. Step 6: Final answer
    x = 119,106.70

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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.