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Finding the Fourth Proportional to 1,145.49, 1,580.78 and 621.51

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Solution

The fourth proportional to 1,145.49, 1,580.78 and 621.51 is: 857.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,145.49 : 1,580.78 = 621.51 : x
  2. Step 2: Convert to fraction form
    1,145.49/1,580.78 = 621.51/x
  3. Step 3: Cross multiply
    1,145.49x = 1,580.78 × 621.51
  4. Step 4: Simplify right side
    1,145.49x = 982,467.47
  5. Step 5: Solve for x
    x = 982,467.47/1,145.49
  6. Step 6: Final answer
    x = 857.68

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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.