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Finding the Fourth Proportional to 1,119.81, 1,678.47 and 570.86

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Solution

The fourth proportional to 1,119.81, 1,678.47 and 570.86 is: 855.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,119.81 : 1,678.47 = 570.86 : x
  2. Step 2: Convert to fraction form
    1,119.81/1,678.47 = 570.86/x
  3. Step 3: Cross multiply
    1,119.81x = 1,678.47 × 570.86
  4. Step 4: Simplify right side
    1,119.81x = 958,162.99
  5. Step 5: Solve for x
    x = 958,162.99/1,119.81
  6. Step 6: Final answer
    x = 855.65

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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.