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Finding the Fourth Proportional to 917,138.20, 1,375,768.04 and 318,036.28

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Solution

The fourth proportional to 917,138.20, 1,375,768.04 and 318,036.28 is: 477,075.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    917,138.20 : 1,375,768.04 = 318,036.28 : x
  2. Step 2: Convert to fraction form
    917,138.20/1,375,768.04 = 318,036.28/x
  3. Step 3: Cross multiply
    917,138.20x = 1,375,768.04 × 318,036.28
  4. Step 4: Simplify right side
    917,138.20x = 437,544,149,584.49
  5. Step 5: Solve for x
    x = 437,544,149,584.49/917,138.20
  6. Step 6: Final answer
    x = 477,075.48

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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.