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Finding the Fourth Proportional to 1,666.89, 2,300.29 and 920.90

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Solution

The fourth proportional to 1,666.89, 2,300.29 and 920.90 is: 1,270.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,666.89 : 2,300.29 = 920.90 : x
  2. Step 2: Convert to fraction form
    1,666.89/2,300.29 = 920.90/x
  3. Step 3: Cross multiply
    1,666.89x = 2,300.29 × 920.90
  4. Step 4: Simplify right side
    1,666.89x = 2,118,325.56
  5. Step 5: Solve for x
    x = 2,118,325.56/1,666.89
  6. Step 6: Final answer
    x = 1,270.83

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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.