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Finding the Fourth Proportional to 953.78, 1,316.36 and 555.39

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Solution

The fourth proportional to 953.78, 1,316.36 and 555.39 is: 766.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.78 : 1,316.36 = 555.39 : x
  2. Step 2: Convert to fraction form
    953.78/1,316.36 = 555.39/x
  3. Step 3: Cross multiply
    953.78x = 1,316.36 × 555.39
  4. Step 4: Simplify right side
    953.78x = 731,093.18
  5. Step 5: Solve for x
    x = 731,093.18/953.78
  6. Step 6: Final answer
    x = 766.52

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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.