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Finding the Fourth Proportional to 926.19, 1,278.05 and 553.09

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Solution

The fourth proportional to 926.19, 1,278.05 and 553.09 is: 763.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.19 : 1,278.05 = 553.09 : x
  2. Step 2: Convert to fraction form
    926.19/1,278.05 = 553.09/x
  3. Step 3: Cross multiply
    926.19x = 1,278.05 × 553.09
  4. Step 4: Simplify right side
    926.19x = 706,873.91
  5. Step 5: Solve for x
    x = 706,873.91/926.19
  6. Step 6: Final answer
    x = 763.21

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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.