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Finding the Fourth Proportional to 1,145.71, 1,581.08 and 621.74

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Solution

The fourth proportional to 1,145.71, 1,581.08 and 621.74 is: 858.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.71 : 1,581.08 = 621.74 : x
  2. Step 2: Convert to fraction form
    1,145.71/1,581.08 = 621.74/x
  3. Step 3: Cross multiply
    1,145.71x = 1,581.08 × 621.74
  4. Step 4: Simplify right side
    1,145.71x = 983,015.29
  5. Step 5: Solve for x
    x = 983,015.29/1,145.71
  6. Step 6: Final answer
    x = 858.00

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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.