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Finding the Fourth Proportional to 1,036.41, 1,430.95 and 789.01

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Solution

The fourth proportional to 1,036.41, 1,430.95 and 789.01 is: 1,089.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,036.41 : 1,430.95 = 789.01 : x
  2. Step 2: Convert to fraction form
    1,036.41/1,430.95 = 789.01/x
  3. Step 3: Cross multiply
    1,036.41x = 1,430.95 × 789.01
  4. Step 4: Simplify right side
    1,036.41x = 1,129,029.79
  5. Step 5: Solve for x
    x = 1,129,029.79/1,036.41
  6. Step 6: Final answer
    x = 1,089.36

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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.