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Finding the Fourth Proportional to 948.31, 1,308.63 and 555.37

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Solution

The fourth proportional to 948.31, 1,308.63 and 555.37 is: 766.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.31 : 1,308.63 = 555.37 : x
  2. Step 2: Convert to fraction form
    948.31/1,308.63 = 555.37/x
  3. Step 3: Cross multiply
    948.31x = 1,308.63 × 555.37
  4. Step 4: Simplify right side
    948.31x = 726,773.84
  5. Step 5: Solve for x
    x = 726,773.84/948.31
  6. Step 6: Final answer
    x = 766.39

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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.