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Finding the Fourth Proportional to 1,315.54, 1,815.40 and 755.93

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Solution

The fourth proportional to 1,315.54, 1,815.40 and 755.93 is: 1,043.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.54 : 1,815.40 = 755.93 : x
  2. Step 2: Convert to fraction form
    1,315.54/1,815.40 = 755.93/x
  3. Step 3: Cross multiply
    1,315.54x = 1,815.40 × 755.93
  4. Step 4: Simplify right side
    1,315.54x = 1,372,302.47
  5. Step 5: Solve for x
    x = 1,372,302.47/1,315.54
  6. Step 6: Final answer
    x = 1,043.15

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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.