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Finding the Fourth Proportional to 786.72, 1,179.12 and 554.40

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Solution

The fourth proportional to 786.72, 1,179.12 and 554.40 is: 830.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    786.72 : 1,179.12 = 554.40 : x
  2. Step 2: Convert to fraction form
    786.72/1,179.12 = 554.40/x
  3. Step 3: Cross multiply
    786.72x = 1,179.12 × 554.40
  4. Step 4: Simplify right side
    786.72x = 653,704.13
  5. Step 5: Solve for x
    x = 653,704.13/786.72
  6. Step 6: Final answer
    x = 830.92

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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.