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Finding the Fourth Proportional to 956.81, 1,320.57 and 621.13

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Solution

The fourth proportional to 956.81, 1,320.57 and 621.13 is: 857.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.81 : 1,320.57 = 621.13 : x
  2. Step 2: Convert to fraction form
    956.81/1,320.57 = 621.13/x
  3. Step 3: Cross multiply
    956.81x = 1,320.57 × 621.13
  4. Step 4: Simplify right side
    956.81x = 820,239.04
  5. Step 5: Solve for x
    x = 820,239.04/956.81
  6. Step 6: Final answer
    x = 857.26

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Double scale
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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.