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Finding the Fourth Proportional to 1,326.02, 1,830.78 and 829.40

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Solution

The fourth proportional to 1,326.02, 1,830.78 and 829.40 is: 1,145.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,326.02 : 1,830.78 = 829.40 : x
  2. Step 2: Convert to fraction form
    1,326.02/1,830.78 = 829.40/x
  3. Step 3: Cross multiply
    1,326.02x = 1,830.78 × 829.40
  4. Step 4: Simplify right side
    1,326.02x = 1,518,448.93
  5. Step 5: Solve for x
    x = 1,518,448.93/1,326.02
  6. Step 6: Final answer
    x = 1,145.12

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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.