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Finding the Fourth Proportional to 1,386.70, 2,078.83 and 900.70

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Solution

The fourth proportional to 1,386.70, 2,078.83 and 900.70 is: 1,350.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.70 : 2,078.83 = 900.70 : x
  2. Step 2: Convert to fraction form
    1,386.70/2,078.83 = 900.70/x
  3. Step 3: Cross multiply
    1,386.70x = 2,078.83 × 900.70
  4. Step 4: Simplify right side
    1,386.70x = 1,872,402.18
  5. Step 5: Solve for x
    x = 1,872,402.18/1,386.70
  6. Step 6: Final answer
    x = 1,350.26

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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.