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Finding the Fourth Proportional to 1,945.77, 2,918.65 and 712.64

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Solution

The fourth proportional to 1,945.77, 2,918.65 and 712.64 is: 1,068.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,945.77 : 2,918.65 = 712.64 : x
  2. Step 2: Convert to fraction form
    1,945.77/2,918.65 = 712.64/x
  3. Step 3: Cross multiply
    1,945.77x = 2,918.65 × 712.64
  4. Step 4: Simplify right side
    1,945.77x = 2,079,946.74
  5. Step 5: Solve for x
    x = 2,079,946.74/1,945.77
  6. Step 6: Final answer
    x = 1,068.96

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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.