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Finding the Fourth Proportional to 212,659.20, 318,988.80 and 64,915.20

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Solution

The fourth proportional to 212,659.20, 318,988.80 and 64,915.20 is: 97,372.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    212,659.20 : 318,988.80 = 64,915.20 : x
  2. Step 2: Convert to fraction form
    212,659.20/318,988.80 = 64,915.20/x
  3. Step 3: Cross multiply
    212,659.20x = 318,988.80 × 64,915.20
  4. Step 4: Simplify right side
    212,659.20x = 20,707,221,749.76
  5. Step 5: Solve for x
    x = 20,707,221,749.76/212,659.20
  6. Step 6: Final answer
    x = 97,372.80

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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.