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Finding the Fourth Proportional to 1,145.78, 1,581.16 and 621.81

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Solution

The fourth proportional to 1,145.78, 1,581.16 and 621.81 is: 858.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.78 : 1,581.16 = 621.81 : x
  2. Step 2: Convert to fraction form
    1,145.78/1,581.16 = 621.81/x
  3. Step 3: Cross multiply
    1,145.78x = 1,581.16 × 621.81
  4. Step 4: Simplify right side
    1,145.78x = 983,170.08
  5. Step 5: Solve for x
    x = 983,170.08/1,145.78
  6. Step 6: Final answer
    x = 858.08

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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.