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Finding the Fourth Proportional to 1,142.25, 1,576.09 and 670.13

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Solution

The fourth proportional to 1,142.25, 1,576.09 and 670.13 is: 924.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,142.25 : 1,576.09 = 670.13 : x
  2. Step 2: Convert to fraction form
    1,142.25/1,576.09 = 670.13/x
  3. Step 3: Cross multiply
    1,142.25x = 1,576.09 × 670.13
  4. Step 4: Simplify right side
    1,142.25x = 1,056,185.19
  5. Step 5: Solve for x
    x = 1,056,185.19/1,142.25
  6. Step 6: Final answer
    x = 924.65

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1.5x scale

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.