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Finding the Fourth Proportional to 1,365.20, 1,884.02 and 775.72

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Solution

The fourth proportional to 1,365.20, 1,884.02 and 775.72 is: 1,070.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,365.20 : 1,884.02 = 775.72 : x
  2. Step 2: Convert to fraction form
    1,365.20/1,884.02 = 775.72/x
  3. Step 3: Cross multiply
    1,365.20x = 1,884.02 × 775.72
  4. Step 4: Simplify right side
    1,365.20x = 1,461,471.99
  5. Step 5: Solve for x
    x = 1,461,471.99/1,365.20
  6. Step 6: Final answer
    x = 1,070.52

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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.