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Finding the Fourth Proportional to 830.64, 1,247.40 and 763.12

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Solution

The fourth proportional to 830.64, 1,247.40 and 763.12 is: 1,146.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    830.64 : 1,247.40 = 763.12 : x
  2. Step 2: Convert to fraction form
    830.64/1,247.40 = 763.12/x
  3. Step 3: Cross multiply
    830.64x = 1,247.40 × 763.12
  4. Step 4: Simplify right side
    830.64x = 951,915.89
  5. Step 5: Solve for x
    x = 951,915.89/830.64
  6. Step 6: Final answer
    x = 1,146.00

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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.