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Finding the Fourth Proportional to 18,887.56, 28,335.59 and 6,407.89

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Solution

The fourth proportional to 18,887.56, 28,335.59 and 6,407.89 is: 9,613.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,887.56 : 28,335.59 = 6,407.89 : x
  2. Step 2: Convert to fraction form
    18,887.56/28,335.59 = 6,407.89/x
  3. Step 3: Cross multiply
    18,887.56x = 28,335.59 × 6,407.89
  4. Step 4: Simplify right side
    18,887.56x = 181,571,343.81
  5. Step 5: Solve for x
    x = 181,571,343.81/18,887.56
  6. Step 6: Final answer
    x = 9,613.28

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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.