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Finding the Fourth Proportional to 10,866.76, 14,999.40 and 6,390.76

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Solution

The fourth proportional to 10,866.76, 14,999.40 and 6,390.76 is: 8,821.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,866.76 : 14,999.40 = 6,390.76 : x
  2. Step 2: Convert to fraction form
    10,866.76/14,999.40 = 6,390.76/x
  3. Step 3: Cross multiply
    10,866.76x = 14,999.40 × 6,390.76
  4. Step 4: Simplify right side
    10,866.76x = 95,857,565.54
  5. Step 5: Solve for x
    x = 95,857,565.54/10,866.76
  6. Step 6: Final answer
    x = 8,821.17

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.