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Finding the Fourth Proportional to 1,407.78, 2,111.94 and 705.36

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Solution

The fourth proportional to 1,407.78, 2,111.94 and 705.36 is: 1,058.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,407.78 : 2,111.94 = 705.36 : x
  2. Step 2: Convert to fraction form
    1,407.78/2,111.94 = 705.36/x
  3. Step 3: Cross multiply
    1,407.78x = 2,111.94 × 705.36
  4. Step 4: Simplify right side
    1,407.78x = 1,489,678.00
  5. Step 5: Solve for x
    x = 1,489,678.00/1,407.78
  6. Step 6: Final answer
    x = 1,058.18

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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.