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Finding the Fourth Proportional to 1,089.30, 1,634.40 and 783.12

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Solution

The fourth proportional to 1,089.30, 1,634.40 and 783.12 is: 1,175.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,089.30 : 1,634.40 = 783.12 : x
  2. Step 2: Convert to fraction form
    1,089.30/1,634.40 = 783.12/x
  3. Step 3: Cross multiply
    1,089.30x = 1,634.40 × 783.12
  4. Step 4: Simplify right side
    1,089.30x = 1,279,931.33
  5. Step 5: Solve for x
    x = 1,279,931.33/1,089.30
  6. Step 6: Final answer
    x = 1,175.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.