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Finding the Fourth Proportional to 941.49, 1,298.21 and 642.78

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Solution

The fourth proportional to 941.49, 1,298.21 and 642.78 is: 886.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    941.49 : 1,298.21 = 642.78 : x
  2. Step 2: Convert to fraction form
    941.49/1,298.21 = 642.78/x
  3. Step 3: Cross multiply
    941.49x = 1,298.21 × 642.78
  4. Step 4: Simplify right side
    941.49x = 834,460.21
  5. Step 5: Solve for x
    x = 834,460.21/941.49
  6. Step 6: Final answer
    x = 886.32

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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.