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Finding the Fourth Proportional to 1,407.90, 2,111.75 and 483.36

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Solution

The fourth proportional to 1,407.90, 2,111.75 and 483.36 is: 725.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.90 : 2,111.75 = 483.36 : x
  2. Step 2: Convert to fraction form
    1,407.90/2,111.75 = 483.36/x
  3. Step 3: Cross multiply
    1,407.90x = 2,111.75 × 483.36
  4. Step 4: Simplify right side
    1,407.90x = 1,020,735.48
  5. Step 5: Solve for x
    x = 1,020,735.48/1,407.90
  6. Step 6: Final answer
    x = 725.01

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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.