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Finding the Fourth Proportional to 833.09, 1,148.80 and 715.45

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Solution

The fourth proportional to 833.09, 1,148.80 and 715.45 is: 986.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    833.09 : 1,148.80 = 715.45 : x
  2. Step 2: Convert to fraction form
    833.09/1,148.80 = 715.45/x
  3. Step 3: Cross multiply
    833.09x = 1,148.80 × 715.45
  4. Step 4: Simplify right side
    833.09x = 821,906.28
  5. Step 5: Solve for x
    x = 821,906.28/833.09
  6. Step 6: Final answer
    x = 986.58

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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.