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Finding the Fourth Proportional to 1,005.89, 1,507.68 and 389.29

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Solution

The fourth proportional to 1,005.89, 1,507.68 and 389.29 is: 583.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,005.89 : 1,507.68 = 389.29 : x
  2. Step 2: Convert to fraction form
    1,005.89/1,507.68 = 389.29/x
  3. Step 3: Cross multiply
    1,005.89x = 1,507.68 × 389.29
  4. Step 4: Simplify right side
    1,005.89x = 586,924.75
  5. Step 5: Solve for x
    x = 586,924.75/1,005.89
  6. Step 6: Final answer
    x = 583.49

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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.