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Finding the Fourth Proportional to 955.95, 1,319.84 and 620.47

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Solution

The fourth proportional to 955.95, 1,319.84 and 620.47 is: 856.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    955.95 : 1,319.84 = 620.47 : x
  2. Step 2: Convert to fraction form
    955.95/1,319.84 = 620.47/x
  3. Step 3: Cross multiply
    955.95x = 1,319.84 × 620.47
  4. Step 4: Simplify right side
    955.95x = 818,921.12
  5. Step 5: Solve for x
    x = 818,921.12/955.95
  6. Step 6: Final answer
    x = 856.66

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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.