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Finding the Fourth Proportional to 1,145.84, 1,581.21 and 621.86

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Solution

The fourth proportional to 1,145.84, 1,581.21 and 621.86 is: 858.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.84 : 1,581.21 = 621.86 : x
  2. Step 2: Convert to fraction form
    1,145.84/1,581.21 = 621.86/x
  3. Step 3: Cross multiply
    1,145.84x = 1,581.21 × 621.86
  4. Step 4: Simplify right side
    1,145.84x = 983,283.34
  5. Step 5: Solve for x
    x = 983,283.34/1,145.84
  6. Step 6: Final answer
    x = 858.14

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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.