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Finding the Fourth Proportional to 1,021.79, 1,533.27 and 611.72

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Solution

The fourth proportional to 1,021.79, 1,533.27 and 611.72 is: 917.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,021.79 : 1,533.27 = 611.72 : x
  2. Step 2: Convert to fraction form
    1,021.79/1,533.27 = 611.72/x
  3. Step 3: Cross multiply
    1,021.79x = 1,533.27 × 611.72
  4. Step 4: Simplify right side
    1,021.79x = 937,924.26
  5. Step 5: Solve for x
    x = 937,924.26/1,021.79
  6. Step 6: Final answer
    x = 917.93

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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.