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Finding the Fourth Proportional to 1,142.65, 1,575.68 and 977.41

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Solution

The fourth proportional to 1,142.65, 1,575.68 and 977.41 is: 1,347.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.65 : 1,575.68 = 977.41 : x
  2. Step 2: Convert to fraction form
    1,142.65/1,575.68 = 977.41/x
  3. Step 3: Cross multiply
    1,142.65x = 1,575.68 × 977.41
  4. Step 4: Simplify right side
    1,142.65x = 1,540,076.56
  5. Step 5: Solve for x
    x = 1,540,076.56/1,142.65
  6. Step 6: Final answer
    x = 1,347.81

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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.