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Finding the Fourth Proportional to 948.78, 1,309.01 and 555.53

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Solution

The fourth proportional to 948.78, 1,309.01 and 555.53 is: 766.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    948.78 : 1,309.01 = 555.53 : x
  2. Step 2: Convert to fraction form
    948.78/1,309.01 = 555.53/x
  3. Step 3: Cross multiply
    948.78x = 1,309.01 × 555.53
  4. Step 4: Simplify right side
    948.78x = 727,185.00
  5. Step 5: Solve for x
    x = 727,185.00/948.78
  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.