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Finding the Fourth Proportional to 8,430.17, 12,641.18 and 4,921.21

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Solution

The fourth proportional to 8,430.17, 12,641.18 and 4,921.21 is: 7,379.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,430.17 : 12,641.18 = 4,921.21 : x
  2. Step 2: Convert to fraction form
    8,430.17/12,641.18 = 4,921.21/x
  3. Step 3: Cross multiply
    8,430.17x = 12,641.18 × 4,921.21
  4. Step 4: Simplify right side
    8,430.17x = 62,209,813.62
  5. Step 5: Solve for x
    x = 62,209,813.62/8,430.17
  6. Step 6: Final answer
    x = 7,379.43

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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.