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Finding the Fourth Proportional to 756.68, 1,045.86 and 698.36

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Solution

The fourth proportional to 756.68, 1,045.86 and 698.36 is: 965.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    756.68 : 1,045.86 = 698.36 : x
  2. Step 2: Convert to fraction form
    756.68/1,045.86 = 698.36/x
  3. Step 3: Cross multiply
    756.68x = 1,045.86 × 698.36
  4. Step 4: Simplify right side
    756.68x = 730,386.79
  5. Step 5: Solve for x
    x = 730,386.79/756.68
  6. Step 6: Final answer
    x = 965.25

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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.