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Finding the Fourth Proportional to 1,133.74, 1,565.75 and 780.58

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Solution

The fourth proportional to 1,133.74, 1,565.75 and 780.58 is: 1,078.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.74 : 1,565.75 = 780.58 : x
  2. Step 2: Convert to fraction form
    1,133.74/1,565.75 = 780.58/x
  3. Step 3: Cross multiply
    1,133.74x = 1,565.75 × 780.58
  4. Step 4: Simplify right side
    1,133.74x = 1,222,187.26
  5. Step 5: Solve for x
    x = 1,222,187.26/1,133.74
  6. Step 6: Final answer
    x = 1,078.01

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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.