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Finding the Fourth Proportional to 926.84, 1,390.56 and 440

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Solution

The fourth proportional to 926.84, 1,390.56 and 440 is: 660.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.84 : 1,390.56 = 440 : x
  2. Step 2: Convert to fraction form
    926.84/1,390.56 = 440/x
  3. Step 3: Cross multiply
    926.84x = 1,390.56 × 440
  4. Step 4: Simplify right side
    926.84x = 611,846.40
  5. Step 5: Solve for x
    x = 611,846.40/926.84
  6. Step 6: Final answer
    x = 660.14

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.