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Finding the Fourth Proportional to 9,130.79, 12,600.90 and 5,151.80

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Solution

The fourth proportional to 9,130.79, 12,600.90 and 5,151.80 is: 7,109.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    9,130.79 : 12,600.90 = 5,151.80 : x
  2. Step 2: Convert to fraction form
    9,130.79/12,600.90 = 5,151.80/x
  3. Step 3: Cross multiply
    9,130.79x = 12,600.90 × 5,151.80
  4. Step 4: Simplify right side
    9,130.79x = 64,917,348.12
  5. Step 5: Solve for x
    x = 64,917,348.12/9,130.79
  6. Step 6: Final answer
    x = 7,109.72

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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.