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Finding the Fourth Proportional to 438,720.80, 658,081.20 and 388,857.20

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Solution

The fourth proportional to 438,720.80, 658,081.20 and 388,857.20 is: 583,285.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,720.80 : 658,081.20 = 388,857.20 : x
  2. Step 2: Convert to fraction form
    438,720.80/658,081.20 = 388,857.20/x
  3. Step 3: Cross multiply
    438,720.80x = 658,081.20 × 388,857.20
  4. Step 4: Simplify right side
    438,720.80x = 255,899,612,804.64
  5. Step 5: Solve for x
    x = 255,899,612,804.64/438,720.80
  6. Step 6: Final answer
    x = 583,285.80

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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.