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Finding the Fourth Proportional to 955.15, 1,317.66 and 623.45

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Solution

The fourth proportional to 955.15, 1,317.66 and 623.45 is: 860.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.15 : 1,317.66 = 623.45 : x
  2. Step 2: Convert to fraction form
    955.15/1,317.66 = 623.45/x
  3. Step 3: Cross multiply
    955.15x = 1,317.66 × 623.45
  4. Step 4: Simplify right side
    955.15x = 821,495.13
  5. Step 5: Solve for x
    x = 821,495.13/955.15
  6. Step 6: Final answer
    x = 860.07

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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.