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Finding the Fourth Proportional to 1,365.28, 1,884.20 and 776

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Solution

The fourth proportional to 1,365.28, 1,884.20 and 776 is: 1,070.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,365.28 : 1,884.20 = 776 : x
  2. Step 2: Convert to fraction form
    1,365.28/1,884.20 = 776/x
  3. Step 3: Cross multiply
    1,365.28x = 1,884.20 × 776
  4. Step 4: Simplify right side
    1,365.28x = 1,462,139.20
  5. Step 5: Solve for x
    x = 1,462,139.20/1,365.28
  6. Step 6: Final answer
    x = 1,070.94

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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.