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Finding the Fourth Proportional to 8,579.40, 12,897.90 and 7,312.20

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Solution

The fourth proportional to 8,579.40, 12,897.90 and 7,312.20 is: 10,992.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,579.40 : 12,897.90 = 7,312.20 : x
  2. Step 2: Convert to fraction form
    8,579.40/12,897.90 = 7,312.20/x
  3. Step 3: Cross multiply
    8,579.40x = 12,897.90 × 7,312.20
  4. Step 4: Simplify right side
    8,579.40x = 94,312,024.38
  5. Step 5: Solve for x
    x = 94,312,024.38/8,579.40
  6. Step 6: Final answer
    x = 10,992.85

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1.5x scale

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.