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Finding the Fourth Proportional to 1,307.70, 1,804.71 and 810.63

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Solution

The fourth proportional to 1,307.70, 1,804.71 and 810.63 is: 1,118.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,307.70 : 1,804.71 = 810.63 : x
  2. Step 2: Convert to fraction form
    1,307.70/1,804.71 = 810.63/x
  3. Step 3: Cross multiply
    1,307.70x = 1,804.71 × 810.63
  4. Step 4: Simplify right side
    1,307.70x = 1,462,952.07
  5. Step 5: Solve for x
    x = 1,462,952.07/1,307.70
  6. Step 6: Final answer
    x = 1,118.72

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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.