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Finding the Fourth Proportional to 926.81, 1,388.15 and 666.02

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Solution

The fourth proportional to 926.81, 1,388.15 and 666.02 is: 997.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    926.81 : 1,388.15 = 666.02 : x
  2. Step 2: Convert to fraction form
    926.81/1,388.15 = 666.02/x
  3. Step 3: Cross multiply
    926.81x = 1,388.15 × 666.02
  4. Step 4: Simplify right side
    926.81x = 924,535.80
  5. Step 5: Solve for x
    x = 924,535.80/926.81
  6. Step 6: Final answer
    x = 997.55

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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.