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Finding the Fourth Proportional to 1,235.79, 1,705.55 and 711.99

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Solution

The fourth proportional to 1,235.79, 1,705.55 and 711.99 is: 982.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,235.79 : 1,705.55 = 711.99 : x
  2. Step 2: Convert to fraction form
    1,235.79/1,705.55 = 711.99/x
  3. Step 3: Cross multiply
    1,235.79x = 1,705.55 × 711.99
  4. Step 4: Simplify right side
    1,235.79x = 1,214,330.98
  5. Step 5: Solve for x
    x = 1,214,330.98/1,235.79
  6. Step 6: Final answer
    x = 982.64

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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.