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Finding the Fourth Proportional to 1,420.18, 1,960.54 and 948.36

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Solution

The fourth proportional to 1,420.18, 1,960.54 and 948.36 is: 1,309.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,420.18 : 1,960.54 = 948.36 : x
  2. Step 2: Convert to fraction form
    1,420.18/1,960.54 = 948.36/x
  3. Step 3: Cross multiply
    1,420.18x = 1,960.54 × 948.36
  4. Step 4: Simplify right side
    1,420.18x = 1,859,297.71
  5. Step 5: Solve for x
    x = 1,859,297.71/1,420.18
  6. Step 6: Final answer
    x = 1,309.20

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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.