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Finding the Fourth Proportional to 8,603.40, 12,918.30 and 4,715.40

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Solution

The fourth proportional to 8,603.40, 12,918.30 and 4,715.40 is: 7,080.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,603.40 : 12,918.30 = 4,715.40 : x
  2. Step 2: Convert to fraction form
    8,603.40/12,918.30 = 4,715.40/x
  3. Step 3: Cross multiply
    8,603.40x = 12,918.30 × 4,715.40
  4. Step 4: Simplify right side
    8,603.40x = 60,914,951.82
  5. Step 5: Solve for x
    x = 60,914,951.82/8,603.40
  6. Step 6: Final answer
    x = 7,080.33

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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.