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Finding the Fourth Proportional to 1,307.85, 1,804.86 and 718.39

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Solution

The fourth proportional to 1,307.85, 1,804.86 and 718.39 is: 991.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.85 : 1,804.86 = 718.39 : x
  2. Step 2: Convert to fraction form
    1,307.85/1,804.86 = 718.39/x
  3. Step 3: Cross multiply
    1,307.85x = 1,804.86 × 718.39
  4. Step 4: Simplify right side
    1,307.85x = 1,296,593.38
  5. Step 5: Solve for x
    x = 1,296,593.38/1,307.85
  6. Step 6: Final answer
    x = 991.39

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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.