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Finding the Fourth Proportional to 783.01, 1,078.10 and 664.75

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Solution

The fourth proportional to 783.01, 1,078.10 and 664.75 is: 915.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.01 : 1,078.10 = 664.75 : x
  2. Step 2: Convert to fraction form
    783.01/1,078.10 = 664.75/x
  3. Step 3: Cross multiply
    783.01x = 1,078.10 × 664.75
  4. Step 4: Simplify right side
    783.01x = 716,668.84
  5. Step 5: Solve for x
    x = 716,668.84/783.01
  6. Step 6: Final answer
    x = 915.27

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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.