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Finding the Fourth Proportional to 690.71, 1,034.37 and 617.81

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Solution

The fourth proportional to 690.71, 1,034.37 and 617.81 is: 925.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    690.71 : 1,034.37 = 617.81 : x
  2. Step 2: Convert to fraction form
    690.71/1,034.37 = 617.81/x
  3. Step 3: Cross multiply
    690.71x = 1,034.37 × 617.81
  4. Step 4: Simplify right side
    690.71x = 639,038.96
  5. Step 5: Solve for x
    x = 639,038.96/690.71
  6. Step 6: Final answer
    x = 925.20

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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.