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Finding the Fourth Proportional to 1,316.93, 1,976.87 and 830.25

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Solution

The fourth proportional to 1,316.93, 1,976.87 and 830.25 is: 1,246.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,316.93 : 1,976.87 = 830.25 : x
  2. Step 2: Convert to fraction form
    1,316.93/1,976.87 = 830.25/x
  3. Step 3: Cross multiply
    1,316.93x = 1,976.87 × 830.25
  4. Step 4: Simplify right side
    1,316.93x = 1,641,298.39
  5. Step 5: Solve for x
    x = 1,641,298.39/1,316.93
  6. Step 6: Final answer
    x = 1,246.31

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.