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Finding the Fourth Proportional to 975.29, 1,345.18 and 620.86

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Solution

The fourth proportional to 975.29, 1,345.18 and 620.86 is: 856.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    975.29 : 1,345.18 = 620.86 : x
  2. Step 2: Convert to fraction form
    975.29/1,345.18 = 620.86/x
  3. Step 3: Cross multiply
    975.29x = 1,345.18 × 620.86
  4. Step 4: Simplify right side
    975.29x = 835,168.45
  5. Step 5: Solve for x
    x = 835,168.45/975.29
  6. Step 6: Final answer
    x = 856.33

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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.