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Finding the Fourth Proportional to 956.69, 1,321.13 and 621.17

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Solution

The fourth proportional to 956.69, 1,321.13 and 621.17 is: 857.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    956.69 : 1,321.13 = 621.17 : x
  2. Step 2: Convert to fraction form
    956.69/1,321.13 = 621.17/x
  3. Step 3: Cross multiply
    956.69x = 1,321.13 × 621.17
  4. Step 4: Simplify right side
    956.69x = 820,646.32
  5. Step 5: Solve for x
    x = 820,646.32/956.69
  6. Step 6: Final answer
    x = 857.80

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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.