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Finding the Fourth Proportional to 913.06, 1,370.40 and 859.60

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Solution

The fourth proportional to 913.06, 1,370.40 and 859.60 is: 1,290.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    913.06 : 1,370.40 = 859.60 : x
  2. Step 2: Convert to fraction form
    913.06/1,370.40 = 859.60/x
  3. Step 3: Cross multiply
    913.06x = 1,370.40 × 859.60
  4. Step 4: Simplify right side
    913.06x = 1,177,995.84
  5. Step 5: Solve for x
    x = 1,177,995.84/913.06
  6. Step 6: Final answer
    x = 1,290.16

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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.