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Finding the Fourth Proportional to 219,216.40, 328,824.60 and 212,655.40

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Solution

The fourth proportional to 219,216.40, 328,824.60 and 212,655.40 is: 318,983.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,216.40 : 328,824.60 = 212,655.40 : x
  2. Step 2: Convert to fraction form
    219,216.40/328,824.60 = 212,655.40/x
  3. Step 3: Cross multiply
    219,216.40x = 328,824.60 × 212,655.40
  4. Step 4: Simplify right side
    219,216.40x = 69,926,326,842.84
  5. Step 5: Solve for x
    x = 69,926,326,842.84/219,216.40
  6. Step 6: Final answer
    x = 318,983.10

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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.