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Finding the Fourth Proportional to 1,004.79, 1,507.32 and 311.51

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Solution

The fourth proportional to 1,004.79, 1,507.32 and 311.51 is: 467.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.79 : 1,507.32 = 311.51 : x
  2. Step 2: Convert to fraction form
    1,004.79/1,507.32 = 311.51/x
  3. Step 3: Cross multiply
    1,004.79x = 1,507.32 × 311.51
  4. Step 4: Simplify right side
    1,004.79x = 469,537.72
  5. Step 5: Solve for x
    x = 469,537.72/1,004.79
  6. Step 6: Final answer
    x = 467.30

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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.