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Finding the Fourth Proportional to 926.37, 1,278.42 and 553.37

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Solution

The fourth proportional to 926.37, 1,278.42 and 553.37 is: 763.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.37 : 1,278.42 = 553.37 : x
  2. Step 2: Convert to fraction form
    926.37/1,278.42 = 553.37/x
  3. Step 3: Cross multiply
    926.37x = 1,278.42 × 553.37
  4. Step 4: Simplify right side
    926.37x = 707,430.81
  5. Step 5: Solve for x
    x = 707,430.81/926.37
  6. Step 6: Final answer
    x = 763.66

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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.