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Finding the Fourth Proportional to 428,148.80, 642,223.20 and 401,904.80

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Solution

The fourth proportional to 428,148.80, 642,223.20 and 401,904.80 is: 602,857.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    428,148.80 : 642,223.20 = 401,904.80 : x
  2. Step 2: Convert to fraction form
    428,148.80/642,223.20 = 401,904.80/x
  3. Step 3: Cross multiply
    428,148.80x = 642,223.20 × 401,904.80
  4. Step 4: Simplify right side
    428,148.80x = 258,112,586,751.36
  5. Step 5: Solve for x
    x = 258,112,586,751.36/428,148.80
  6. Step 6: Final answer
    x = 602,857.20

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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.