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Finding the Fourth Proportional to 1,028.98, 1,420.15 and 655.57

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Solution

The fourth proportional to 1,028.98, 1,420.15 and 655.57 is: 904.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,028.98 : 1,420.15 = 655.57 : x
  2. Step 2: Convert to fraction form
    1,028.98/1,420.15 = 655.57/x
  3. Step 3: Cross multiply
    1,028.98x = 1,420.15 × 655.57
  4. Step 4: Simplify right side
    1,028.98x = 931,000.63
  5. Step 5: Solve for x
    x = 931,000.63/1,028.98
  6. Step 6: Final answer
    x = 904.78

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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.