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Finding the Fourth Proportional to 1,270.40, 1,903.93 and 920.18

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Solution

The fourth proportional to 1,270.40, 1,903.93 and 920.18 is: 1,379.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,270.40 : 1,903.93 = 920.18 : x
  2. Step 2: Convert to fraction form
    1,270.40/1,903.93 = 920.18/x
  3. Step 3: Cross multiply
    1,270.40x = 1,903.93 × 920.18
  4. Step 4: Simplify right side
    1,270.40x = 1,751,960.77
  5. Step 5: Solve for x
    x = 1,751,960.77/1,270.40
  6. Step 6: Final answer
    x = 1,379.07

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1.5x scale

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.