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Finding the Fourth Proportional to 1,021.94, 1,533.07 and 918.62

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Solution

The fourth proportional to 1,021.94, 1,533.07 and 918.62 is: 1,378.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.94 : 1,533.07 = 918.62 : x
  2. Step 2: Convert to fraction form
    1,021.94/1,533.07 = 918.62/x
  3. Step 3: Cross multiply
    1,021.94x = 1,533.07 × 918.62
  4. Step 4: Simplify right side
    1,021.94x = 1,408,304.17
  5. Step 5: Solve for x
    x = 1,408,304.17/1,021.94
  6. Step 6: Final answer
    x = 1,378.08

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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.