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Finding the Fourth Proportional to 642.09, 886.65 and 511.68

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Solution

The fourth proportional to 642.09, 886.65 and 511.68 is: 706.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    642.09 : 886.65 = 511.68 : x
  2. Step 2: Convert to fraction form
    642.09/886.65 = 511.68/x
  3. Step 3: Cross multiply
    642.09x = 886.65 × 511.68
  4. Step 4: Simplify right side
    642.09x = 453,681.07
  5. Step 5: Solve for x
    x = 453,681.07/642.09
  6. Step 6: Final answer
    x = 706.57

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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.