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Finding the Fourth Proportional to 760.69, 1,047.84 and 636.31

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Solution

The fourth proportional to 760.69, 1,047.84 and 636.31 is: 876.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    760.69 : 1,047.84 = 636.31 : x
  2. Step 2: Convert to fraction form
    760.69/1,047.84 = 636.31/x
  3. Step 3: Cross multiply
    760.69x = 1,047.84 × 636.31
  4. Step 4: Simplify right side
    760.69x = 666,751.07
  5. Step 5: Solve for x
    x = 666,751.07/760.69
  6. Step 6: Final answer
    x = 876.51

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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.