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Finding the Fourth Proportional to 936.16, 1,292.16 and 642.16

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Solution

The fourth proportional to 936.16, 1,292.16 and 642.16 is: 886.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.16 : 1,292.16 = 642.16 : x
  2. Step 2: Convert to fraction form
    936.16/1,292.16 = 642.16/x
  3. Step 3: Cross multiply
    936.16x = 1,292.16 × 642.16
  4. Step 4: Simplify right side
    936.16x = 829,773.47
  5. Step 5: Solve for x
    x = 829,773.47/936.16
  6. Step 6: Final answer
    x = 886.36

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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.