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Finding the Fourth Proportional to 948.63, 1,308.58 and 555.58

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Solution

The fourth proportional to 948.63, 1,308.58 and 555.58 is: 766.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.63 : 1,308.58 = 555.58 : x
  2. Step 2: Convert to fraction form
    948.63/1,308.58 = 555.58/x
  3. Step 3: Cross multiply
    948.63x = 1,308.58 × 555.58
  4. Step 4: Simplify right side
    948.63x = 727,015.32
  5. Step 5: Solve for x
    x = 727,015.32/948.63
  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.