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Finding the Fourth Proportional to 8,421.16, 11,621.22 and 4,695.40

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Solution

The fourth proportional to 8,421.16, 11,621.22 and 4,695.40 is: 6,479.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,421.16 : 11,621.22 = 4,695.40 : x
  2. Step 2: Convert to fraction form
    8,421.16/11,621.22 = 4,695.40/x
  3. Step 3: Cross multiply
    8,421.16x = 11,621.22 × 4,695.40
  4. Step 4: Simplify right side
    8,421.16x = 54,566,276.39
  5. Step 5: Solve for x
    x = 54,566,276.39/8,421.16
  6. Step 6: Final answer
    x = 6,479.66

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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.