Home / 1,039.40-1,434.14-646.16

Finding the Fourth Proportional to 1,039.40, 1,434.14 and 646.16

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Solution

The fourth proportional to 1,039.40, 1,434.14 and 646.16 is: 891.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,039.40 : 1,434.14 = 646.16 : x
  2. Step 2: Convert to fraction form
    1,039.40/1,434.14 = 646.16/x
  3. Step 3: Cross multiply
    1,039.40x = 1,434.14 × 646.16
  4. Step 4: Simplify right side
    1,039.40x = 926,683.90
  5. Step 5: Solve for x
    x = 926,683.90/1,039.40
  6. Step 6: Final answer
    x = 891.56

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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.