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Finding the Fourth Proportional to 8,470.76, 11,689.88 and 4,642.61

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Solution

The fourth proportional to 8,470.76, 11,689.88 and 4,642.61 is: 6,406.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,470.76 : 11,689.88 = 4,642.61 : x
  2. Step 2: Convert to fraction form
    8,470.76/11,689.88 = 4,642.61/x
  3. Step 3: Cross multiply
    8,470.76x = 11,689.88 × 4,642.61
  4. Step 4: Simplify right side
    8,470.76x = 54,271,472.12
  5. Step 5: Solve for x
    x = 54,271,472.12/8,470.76
  6. Step 6: Final answer
    x = 6,406.92

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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.