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Finding the Fourth Proportional to 1,455.68, 2,008.50 and 931.88

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Solution

The fourth proportional to 1,455.68, 2,008.50 and 931.88 is: 1,285.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,455.68 : 2,008.50 = 931.88 : x
  2. Step 2: Convert to fraction form
    1,455.68/2,008.50 = 931.88/x
  3. Step 3: Cross multiply
    1,455.68x = 2,008.50 × 931.88
  4. Step 4: Simplify right side
    1,455.68x = 1,871,680.98
  5. Step 5: Solve for x
    x = 1,871,680.98/1,455.68
  6. Step 6: Final answer
    x = 1,285.78

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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.