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Finding the Fourth Proportional to 1,205.69, 1,808.53 and 715.47

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Solution

The fourth proportional to 1,205.69, 1,808.53 and 715.47 is: 1,073.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.69 : 1,808.53 = 715.47 : x
  2. Step 2: Convert to fraction form
    1,205.69/1,808.53 = 715.47/x
  3. Step 3: Cross multiply
    1,205.69x = 1,808.53 × 715.47
  4. Step 4: Simplify right side
    1,205.69x = 1,293,948.96
  5. Step 5: Solve for x
    x = 1,293,948.96/1,205.69
  6. Step 6: Final answer
    x = 1,073.20

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.