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Finding the Fourth Proportional to 18,953.60, 28,430.40 and 9,087.80

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Solution

The fourth proportional to 18,953.60, 28,430.40 and 9,087.80 is: 13,631.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,953.60 : 28,430.40 = 9,087.80 : x
  2. Step 2: Convert to fraction form
    18,953.60/28,430.40 = 9,087.80/x
  3. Step 3: Cross multiply
    18,953.60x = 28,430.40 × 9,087.80
  4. Step 4: Simplify right side
    18,953.60x = 258,369,789.12
  5. Step 5: Solve for x
    x = 258,369,789.12/18,953.60
  6. Step 6: Final answer
    x = 13,631.70

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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.