Home / 1,004.13-1,386.81-921.11

Finding the Fourth Proportional to 1,004.13, 1,386.81 and 921.11

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Solution

The fourth proportional to 1,004.13, 1,386.81 and 921.11 is: 1,272.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,004.13 : 1,386.81 = 921.11 : x
  2. Step 2: Convert to fraction form
    1,004.13/1,386.81 = 921.11/x
  3. Step 3: Cross multiply
    1,004.13x = 1,386.81 × 921.11
  4. Step 4: Simplify right side
    1,004.13x = 1,277,397.63
  5. Step 5: Solve for x
    x = 1,277,397.63/1,004.13
  6. Step 6: Final answer
    x = 1,272.14

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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.