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Finding the Fourth Proportional to 1,029.63, 1,420.89 and 587.53

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Solution

The fourth proportional to 1,029.63, 1,420.89 and 587.53 is: 810.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.63 : 1,420.89 = 587.53 : x
  2. Step 2: Convert to fraction form
    1,029.63/1,420.89 = 587.53/x
  3. Step 3: Cross multiply
    1,029.63x = 1,420.89 × 587.53
  4. Step 4: Simplify right side
    1,029.63x = 834,815.50
  5. Step 5: Solve for x
    x = 834,815.50/1,029.63
  6. Step 6: Final answer
    x = 810.79

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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.