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Finding the Fourth Proportional to 1,390.10, 2,075.01 and 1,351.15

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Solution

The fourth proportional to 1,390.10, 2,075.01 and 1,351.15 is: 2,016.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.10 : 2,075.01 = 1,351.15 : x
  2. Step 2: Convert to fraction form
    1,390.10/2,075.01 = 1,351.15/x
  3. Step 3: Cross multiply
    1,390.10x = 2,075.01 × 1,351.15
  4. Step 4: Simplify right side
    1,390.10x = 2,803,639.51
  5. Step 5: Solve for x
    x = 2,803,639.51/1,390.10
  6. Step 6: Final answer
    x = 2,016.87

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.