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Finding the Fourth Proportional to 761.64, 1,048.75 and 628.36

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Solution

The fourth proportional to 761.64, 1,048.75 and 628.36 is: 865.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    761.64 : 1,048.75 = 628.36 : x
  2. Step 2: Convert to fraction form
    761.64/1,048.75 = 628.36/x
  3. Step 3: Cross multiply
    761.64x = 1,048.75 × 628.36
  4. Step 4: Simplify right side
    761.64x = 658,992.55
  5. Step 5: Solve for x
    x = 658,992.55/761.64
  6. Step 6: Final answer
    x = 865.23

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Double scale
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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.