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Finding the Fourth Proportional to 528,858.40, 792,121.20 and 318,128.80

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Solution

The fourth proportional to 528,858.40, 792,121.20 and 318,128.80 is: 476,491.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,858.40 : 792,121.20 = 318,128.80 : x
  2. Step 2: Convert to fraction form
    528,858.40/792,121.20 = 318,128.80/x
  3. Step 3: Cross multiply
    528,858.40x = 792,121.20 × 318,128.80
  4. Step 4: Simplify right side
    528,858.40x = 251,996,566,810.56
  5. Step 5: Solve for x
    x = 251,996,566,810.56/528,858.40
  6. Step 6: Final answer
    x = 476,491.57

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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.