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Finding the Fourth Proportional to 1,321.64, 1,824.12 and 762.50

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Solution

The fourth proportional to 1,321.64, 1,824.12 and 762.50 is: 1,052.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,321.64 : 1,824.12 = 762.50 : x
  2. Step 2: Convert to fraction form
    1,321.64/1,824.12 = 762.50/x
  3. Step 3: Cross multiply
    1,321.64x = 1,824.12 × 762.50
  4. Step 4: Simplify right side
    1,321.64x = 1,390,882.38
  5. Step 5: Solve for x
    x = 1,390,882.38/1,321.64
  6. Step 6: Final answer
    x = 1,052.40

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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.