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Finding the Fourth Proportional to 31,007.60, 42,775.44 and 18,423.44

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Solution

The fourth proportional to 31,007.60, 42,775.44 and 18,423.44 is: 25,415.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    31,007.60 : 42,775.44 = 18,423.44 : x
  2. Step 2: Convert to fraction form
    31,007.60/42,775.44 = 18,423.44/x
  3. Step 3: Cross multiply
    31,007.60x = 42,775.44 × 18,423.44
  4. Step 4: Simplify right side
    31,007.60x = 788,070,538.44
  5. Step 5: Solve for x
    x = 788,070,538.44/31,007.60
  6. Step 6: Final answer
    x = 25,415.40

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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.