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Finding the Fourth Proportional to 1,307.82, 1,804.80 and 718.38

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Solution

The fourth proportional to 1,307.82, 1,804.80 and 718.38 is: 991.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.82 : 1,804.80 = 718.38 : x
  2. Step 2: Convert to fraction form
    1,307.82/1,804.80 = 718.38/x
  3. Step 3: Cross multiply
    1,307.82x = 1,804.80 × 718.38
  4. Step 4: Simplify right side
    1,307.82x = 1,296,532.22
  5. Step 5: Solve for x
    x = 1,296,532.22/1,307.82
  6. Step 6: Final answer
    x = 991.37

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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.