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Finding the Fourth Proportional to 219,330.40, 328,995.60 and 215,831.20

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Solution

The fourth proportional to 219,330.40, 328,995.60 and 215,831.20 is: 323,746.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    219,330.40 : 328,995.60 = 215,831.20 : x
  2. Step 2: Convert to fraction form
    219,330.40/328,995.60 = 215,831.20/x
  3. Step 3: Cross multiply
    219,330.40x = 328,995.60 × 215,831.20
  4. Step 4: Simplify right side
    219,330.40x = 71,007,515,142.72
  5. Step 5: Solve for x
    x = 71,007,515,142.72/219,330.40
  6. Step 6: Final answer
    x = 323,746.80

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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.