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Finding the Fourth Proportional to 430,128.80, 645,322.80 and 305,712.80

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Solution

The fourth proportional to 430,128.80, 645,322.80 and 305,712.80 is: 458,661.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    430,128.80 : 645,322.80 = 305,712.80 : x
  2. Step 2: Convert to fraction form
    430,128.80/645,322.80 = 305,712.80/x
  3. Step 3: Cross multiply
    430,128.80x = 645,322.80 × 305,712.80
  4. Step 4: Simplify right side
    430,128.80x = 197,283,440,091.84
  5. Step 5: Solve for x
    x = 197,283,440,091.84/430,128.80
  6. Step 6: Final answer
    x = 458,661.31

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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.