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Finding the Fourth Proportional to 1,365.90, 1,884.99 and 776.34

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Solution

The fourth proportional to 1,365.90, 1,884.99 and 776.34 is: 1,071.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,365.90 : 1,884.99 = 776.34 : x
  2. Step 2: Convert to fraction form
    1,365.90/1,884.99 = 776.34/x
  3. Step 3: Cross multiply
    1,365.90x = 1,884.99 × 776.34
  4. Step 4: Simplify right side
    1,365.90x = 1,463,393.14
  5. Step 5: Solve for x
    x = 1,463,393.14/1,365.90
  6. Step 6: Final answer
    x = 1,071.38

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1.5x scale

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.