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Finding the Fourth Proportional to 948.30, 1,308.72 and 555.36

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Solution

The fourth proportional to 948.30, 1,308.72 and 555.36 is: 766.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.30 : 1,308.72 = 555.36 : x
  2. Step 2: Convert to fraction form
    948.30/1,308.72 = 555.36/x
  3. Step 3: Cross multiply
    948.30x = 1,308.72 × 555.36
  4. Step 4: Simplify right side
    948.30x = 726,810.74
  5. Step 5: Solve for x
    x = 726,810.74/948.30
  6. Step 6: Final answer
    x = 766.44

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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.