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Finding the Fourth Proportional to 1,157.79, 1,597.75 and 685.66

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Solution

The fourth proportional to 1,157.79, 1,597.75 and 685.66 is: 946.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,157.79 : 1,597.75 = 685.66 : x
  2. Step 2: Convert to fraction form
    1,157.79/1,597.75 = 685.66/x
  3. Step 3: Cross multiply
    1,157.79x = 1,597.75 × 685.66
  4. Step 4: Simplify right side
    1,157.79x = 1,095,503.56
  5. Step 5: Solve for x
    x = 1,095,503.56/1,157.79
  6. Step 6: Final answer
    x = 946.21

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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.