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Finding the Fourth Proportional to 7,800.30, 11,707.74 and 4,869.72

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Solution

The fourth proportional to 7,800.30, 11,707.74 and 4,869.72 is: 7,309.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,800.30 : 11,707.74 = 4,869.72 : x
  2. Step 2: Convert to fraction form
    7,800.30/11,707.74 = 4,869.72/x
  3. Step 3: Cross multiply
    7,800.30x = 11,707.74 × 4,869.72
  4. Step 4: Simplify right side
    7,800.30x = 57,013,415.63
  5. Step 5: Solve for x
    x = 57,013,415.63/7,800.30
  6. Step 6: Final answer
    x = 7,309.13

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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.