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Finding the Fourth Proportional to 1,354.95, 1,869.80 and 765.47

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Solution

The fourth proportional to 1,354.95, 1,869.80 and 765.47 is: 1,056.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,354.95 : 1,869.80 = 765.47 : x
  2. Step 2: Convert to fraction form
    1,354.95/1,869.80 = 765.47/x
  3. Step 3: Cross multiply
    1,354.95x = 1,869.80 × 765.47
  4. Step 4: Simplify right side
    1,354.95x = 1,431,262.63
  5. Step 5: Solve for x
    x = 1,431,262.63/1,354.95
  6. Step 6: Final answer
    x = 1,056.32

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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.