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Finding the Fourth Proportional to 936.86, 1,293.15 and 642.98

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Solution

The fourth proportional to 936.86, 1,293.15 and 642.98 is: 887.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    936.86 : 1,293.15 = 642.98 : x
  2. Step 2: Convert to fraction form
    936.86/1,293.15 = 642.98/x
  3. Step 3: Cross multiply
    936.86x = 1,293.15 × 642.98
  4. Step 4: Simplify right side
    936.86x = 831,463.12
  5. Step 5: Solve for x
    x = 831,463.12/936.86
  6. Step 6: Final answer
    x = 887.50

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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.