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Finding the Fourth Proportional to 1,386.09, 1,911.08 and 887.91

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Solution

The fourth proportional to 1,386.09, 1,911.08 and 887.91 is: 1,224.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,386.09 : 1,911.08 = 887.91 : x
  2. Step 2: Convert to fraction form
    1,386.09/1,911.08 = 887.91/x
  3. Step 3: Cross multiply
    1,386.09x = 1,911.08 × 887.91
  4. Step 4: Simplify right side
    1,386.09x = 1,696,862.60
  5. Step 5: Solve for x
    x = 1,696,862.60/1,386.09
  6. Step 6: Final answer
    x = 1,224.21

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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.