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Finding the Fourth Proportional to 953.78, 1,316.66 and 618.03

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Solution

The fourth proportional to 953.78, 1,316.66 and 618.03 is: 853.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    953.78 : 1,316.66 = 618.03 : x
  2. Step 2: Convert to fraction form
    953.78/1,316.66 = 618.03/x
  3. Step 3: Cross multiply
    953.78x = 1,316.66 × 618.03
  4. Step 4: Simplify right side
    953.78x = 813,732.29
  5. Step 5: Solve for x
    x = 813,732.29/953.78
  6. Step 6: Final answer
    x = 853.17

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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.