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Finding the Fourth Proportional to 936.69, 1,291.80 and 715.23

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Solution

The fourth proportional to 936.69, 1,291.80 and 715.23 is: 986.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.69 : 1,291.80 = 715.23 : x
  2. Step 2: Convert to fraction form
    936.69/1,291.80 = 715.23/x
  3. Step 3: Cross multiply
    936.69x = 1,291.80 × 715.23
  4. Step 4: Simplify right side
    936.69x = 923,934.11
  5. Step 5: Solve for x
    x = 923,934.11/936.69
  6. Step 6: Final answer
    x = 986.38

Related Problems

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Half scale
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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.