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Finding the Fourth Proportional to 1,145.07, 1,580.21 and 621.11

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Solution

The fourth proportional to 1,145.07, 1,580.21 and 621.11 is: 857.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.07 : 1,580.21 = 621.11 : x
  2. Step 2: Convert to fraction form
    1,145.07/1,580.21 = 621.11/x
  3. Step 3: Cross multiply
    1,145.07x = 1,580.21 × 621.11
  4. Step 4: Simplify right side
    1,145.07x = 981,473.23
  5. Step 5: Solve for x
    x = 981,473.23/1,145.07
  6. Step 6: Final answer
    x = 857.13

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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.