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Finding the Fourth Proportional to 1,390.24, 1,918.44 and 830.89

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Solution

The fourth proportional to 1,390.24, 1,918.44 and 830.89 is: 1,146.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,390.24 : 1,918.44 = 830.89 : x
  2. Step 2: Convert to fraction form
    1,390.24/1,918.44 = 830.89/x
  3. Step 3: Cross multiply
    1,390.24x = 1,918.44 × 830.89
  4. Step 4: Simplify right side
    1,390.24x = 1,594,012.61
  5. Step 5: Solve for x
    x = 1,594,012.61/1,390.24
  6. Step 6: Final answer
    x = 1,146.57

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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.