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Finding the Fourth Proportional to 1,040.30, 1,434.67 and 690.38

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Solution

The fourth proportional to 1,040.30, 1,434.67 and 690.38 is: 952.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040.30 : 1,434.67 = 690.38 : x
  2. Step 2: Convert to fraction form
    1,040.30/1,434.67 = 690.38/x
  3. Step 3: Cross multiply
    1,040.30x = 1,434.67 × 690.38
  4. Step 4: Simplify right side
    1,040.30x = 990,467.47
  5. Step 5: Solve for x
    x = 990,467.47/1,040.30
  6. Step 6: Final answer
    x = 952.10

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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.