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Finding the Fourth Proportional to 926.69, 1,278.12 and 646.84

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Solution

The fourth proportional to 926.69, 1,278.12 and 646.84 is: 892.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.69 : 1,278.12 = 646.84 : x
  2. Step 2: Convert to fraction form
    926.69/1,278.12 = 646.84/x
  3. Step 3: Cross multiply
    926.69x = 1,278.12 × 646.84
  4. Step 4: Simplify right side
    926.69x = 826,732.75
  5. Step 5: Solve for x
    x = 826,732.75/926.69
  6. Step 6: Final answer
    x = 892.14

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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.