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Finding the Fourth Proportional to 1,133.79, 1,700.15 and 665.40

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Solution

The fourth proportional to 1,133.79, 1,700.15 and 665.40 is: 997.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,133.79 : 1,700.15 = 665.40 : x
  2. Step 2: Convert to fraction form
    1,133.79/1,700.15 = 665.40/x
  3. Step 3: Cross multiply
    1,133.79x = 1,700.15 × 665.40
  4. Step 4: Simplify right side
    1,133.79x = 1,131,276.48
  5. Step 5: Solve for x
    x = 1,131,276.48/1,133.79
  6. Step 6: Final answer
    x = 997.78

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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.