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Finding the Fourth Proportional to 1,040, 1,436.42 and 690.08

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Solution

The fourth proportional to 1,040, 1,436.42 and 690.08 is: 953.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,040 : 1,436.42 = 690.08 : x
  2. Step 2: Convert to fraction form
    1,040/1,436.42 = 690.08/x
  3. Step 3: Cross multiply
    1,040x = 1,436.42 × 690.08
  4. Step 4: Simplify right side
    1,040x = 991,244.71
  5. Step 5: Solve for x
    x = 991,244.71/1,040
  6. Step 6: Final answer
    x = 953.12

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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.