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Finding the Fourth Proportional to 1,661.57, 2,491.34 and 621.03

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Solution

The fourth proportional to 1,661.57, 2,491.34 and 621.03 is: 931.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,661.57 : 2,491.34 = 621.03 : x
  2. Step 2: Convert to fraction form
    1,661.57/2,491.34 = 621.03/x
  3. Step 3: Cross multiply
    1,661.57x = 2,491.34 × 621.03
  4. Step 4: Simplify right side
    1,661.57x = 1,547,193.78
  5. Step 5: Solve for x
    x = 1,547,193.78/1,661.57
  6. Step 6: Final answer
    x = 931.17

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.