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Finding the Fourth Proportional to 1,307.40, 1,804.17 and 717.99

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Solution

The fourth proportional to 1,307.40, 1,804.17 and 717.99 is: 990.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.40 : 1,804.17 = 717.99 : x
  2. Step 2: Convert to fraction form
    1,307.40/1,804.17 = 717.99/x
  3. Step 3: Cross multiply
    1,307.40x = 1,804.17 × 717.99
  4. Step 4: Simplify right side
    1,307.40x = 1,295,376.02
  5. Step 5: Solve for x
    x = 1,295,376.02/1,307.40
  6. Step 6: Final answer
    x = 990.80

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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.