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Finding the Fourth Proportional to 1,313.90, 1,970.78 and 448.20

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Solution

The fourth proportional to 1,313.90, 1,970.78 and 448.20 is: 672.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,313.90 : 1,970.78 = 448.20 : x
  2. Step 2: Convert to fraction form
    1,313.90/1,970.78 = 448.20/x
  3. Step 3: Cross multiply
    1,313.90x = 1,970.78 × 448.20
  4. Step 4: Simplify right side
    1,313.90x = 883,303.60
  5. Step 5: Solve for x
    x = 883,303.60/1,313.90
  6. Step 6: Final answer
    x = 672.28

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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.