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Finding the Fourth Proportional to 783.68, 1,080.48 and 629.12

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Solution

The fourth proportional to 783.68, 1,080.48 and 629.12 is: 867.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    783.68 : 1,080.48 = 629.12 : x
  2. Step 2: Convert to fraction form
    783.68/1,080.48 = 629.12/x
  3. Step 3: Cross multiply
    783.68x = 1,080.48 × 629.12
  4. Step 4: Simplify right side
    783.68x = 679,751.58
  5. Step 5: Solve for x
    x = 679,751.58/783.68
  6. Step 6: Final answer
    x = 867.38

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1.5x scale

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.