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Finding the Fourth Proportional to 1,315.78, 1,814.58 and 818.26

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Solution

The fourth proportional to 1,315.78, 1,814.58 and 818.26 is: 1,128.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,315.78 : 1,814.58 = 818.26 : x
  2. Step 2: Convert to fraction form
    1,315.78/1,814.58 = 818.26/x
  3. Step 3: Cross multiply
    1,315.78x = 1,814.58 × 818.26
  4. Step 4: Simplify right side
    1,315.78x = 1,484,798.23
  5. Step 5: Solve for x
    x = 1,484,798.23/1,315.78
  6. Step 6: Final answer
    x = 1,128.45

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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.