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Finding the Fourth Proportional to 1,430.46, 1,974.11 and 870.84

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Solution

The fourth proportional to 1,430.46, 1,974.11 and 870.84 is: 1,201.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,430.46 : 1,974.11 = 870.84 : x
  2. Step 2: Convert to fraction form
    1,430.46/1,974.11 = 870.84/x
  3. Step 3: Cross multiply
    1,430.46x = 1,974.11 × 870.84
  4. Step 4: Simplify right side
    1,430.46x = 1,719,119.73
  5. Step 5: Solve for x
    x = 1,719,119.73/1,430.46
  6. Step 6: Final answer
    x = 1,201.80

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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.