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Finding the Fourth Proportional to 926.89, 1,390.68 and 440.02

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Solution

The fourth proportional to 926.89, 1,390.68 and 440.02 is: 660.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.89 : 1,390.68 = 440.02 : x
  2. Step 2: Convert to fraction form
    926.89/1,390.68 = 440.02/x
  3. Step 3: Cross multiply
    926.89x = 1,390.68 × 440.02
  4. Step 4: Simplify right side
    926.89x = 611,927.01
  5. Step 5: Solve for x
    x = 611,927.01/926.89
  6. Step 6: Final answer
    x = 660.19

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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.