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Finding the Fourth Proportional to 219,280.40, 328,920.60 and 212,719.40

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Solution

The fourth proportional to 219,280.40, 328,920.60 and 212,719.40 is: 319,079.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,280.40 : 328,920.60 = 212,719.40 : x
  2. Step 2: Convert to fraction form
    219,280.40/328,920.60 = 212,719.40/x
  3. Step 3: Cross multiply
    219,280.40x = 328,920.60 × 212,719.40
  4. Step 4: Simplify right side
    219,280.40x = 69,967,792,679.64
  5. Step 5: Solve for x
    x = 69,967,792,679.64/219,280.40
  6. Step 6: Final answer
    x = 319,079.10

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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.