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Finding the Fourth Proportional to 1,271.10, 1,902.60 and 906.60

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Solution

The fourth proportional to 1,271.10, 1,902.60 and 906.60 is: 1,357.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,271.10 : 1,902.60 = 906.60 : x
  2. Step 2: Convert to fraction form
    1,271.10/1,902.60 = 906.60/x
  3. Step 3: Cross multiply
    1,271.10x = 1,902.60 × 906.60
  4. Step 4: Simplify right side
    1,271.10x = 1,724,897.16
  5. Step 5: Solve for x
    x = 1,724,897.16/1,271.10
  6. Step 6: Final answer
    x = 1,357.01

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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.