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Finding the Fourth Proportional to 1,533, 2,115.78 and 912.36

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Solution

The fourth proportional to 1,533, 2,115.78 and 912.36 is: 1,259.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,533 : 2,115.78 = 912.36 : x
  2. Step 2: Convert to fraction form
    1,533/2,115.78 = 912.36/x
  3. Step 3: Cross multiply
    1,533x = 2,115.78 × 912.36
  4. Step 4: Simplify right side
    1,533x = 1,930,353.04
  5. Step 5: Solve for x
    x = 1,930,353.04/1,533
  6. Step 6: Final answer
    x = 1,259.20

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.