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Finding the Fourth Proportional to 1,145.06, 1,580.19 and 621.09

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Solution

The fourth proportional to 1,145.06, 1,580.19 and 621.09 is: 857.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.06 : 1,580.19 = 621.09 : x
  2. Step 2: Convert to fraction form
    1,145.06/1,580.19 = 621.09/x
  3. Step 3: Cross multiply
    1,145.06x = 1,580.19 × 621.09
  4. Step 4: Simplify right side
    1,145.06x = 981,440.21
  5. Step 5: Solve for x
    x = 981,440.21/1,145.06
  6. Step 6: Final answer
    x = 857.11

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1.5x scale

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.