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Finding the Fourth Proportional to 1,142.93, 1,712.46 and 621.74

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Solution

The fourth proportional to 1,142.93, 1,712.46 and 621.74 is: 931.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.93 : 1,712.46 = 621.74 : x
  2. Step 2: Convert to fraction form
    1,142.93/1,712.46 = 621.74/x
  3. Step 3: Cross multiply
    1,142.93x = 1,712.46 × 621.74
  4. Step 4: Simplify right side
    1,142.93x = 1,064,704.88
  5. Step 5: Solve for x
    x = 1,064,704.88/1,142.93
  6. Step 6: Final answer
    x = 931.56

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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.