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Finding the Fourth Proportional to 948.39, 1,308.77 and 555.42

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Solution

The fourth proportional to 948.39, 1,308.77 and 555.42 is: 766.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.39 : 1,308.77 = 555.42 : x
  2. Step 2: Convert to fraction form
    948.39/1,308.77 = 555.42/x
  3. Step 3: Cross multiply
    948.39x = 1,308.77 × 555.42
  4. Step 4: Simplify right side
    948.39x = 726,914.26
  5. Step 5: Solve for x
    x = 726,914.26/948.39
  6. Step 6: Final answer
    x = 766.47

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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.