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Finding the Fourth Proportional to 1,029.53, 1,420.70 and 587.39

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Solution

The fourth proportional to 1,029.53, 1,420.70 and 587.39 is: 810.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,029.53 : 1,420.70 = 587.39 : x
  2. Step 2: Convert to fraction form
    1,029.53/1,420.70 = 587.39/x
  3. Step 3: Cross multiply
    1,029.53x = 1,420.70 × 587.39
  4. Step 4: Simplify right side
    1,029.53x = 834,494.93
  5. Step 5: Solve for x
    x = 834,494.93/1,029.53
  6. Step 6: Final answer
    x = 810.56

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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.