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Finding the Fourth Proportional to 1,351.72, 1,868.08 and 1,020

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Solution

The fourth proportional to 1,351.72, 1,868.08 and 1,020 is: 1,409.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,351.72 : 1,868.08 = 1,020 : x
  2. Step 2: Convert to fraction form
    1,351.72/1,868.08 = 1,020/x
  3. Step 3: Cross multiply
    1,351.72x = 1,868.08 × 1,020
  4. Step 4: Simplify right side
    1,351.72x = 1,905,441.60
  5. Step 5: Solve for x
    x = 1,905,441.60/1,351.72
  6. Step 6: Final answer
    x = 1,409.64

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.