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Finding the Fourth Proportional to 74,009.30, 111,129.15 and 42,905.30

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Solution

The fourth proportional to 74,009.30, 111,129.15 and 42,905.30 is: 64,424.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,009.30 : 111,129.15 = 42,905.30 : x
  2. Step 2: Convert to fraction form
    74,009.30/111,129.15 = 42,905.30/x
  3. Step 3: Cross multiply
    74,009.30x = 111,129.15 × 42,905.30
  4. Step 4: Simplify right side
    74,009.30x = 4,768,029,519.50
  5. Step 5: Solve for x
    x = 4,768,029,519.50/74,009.30
  6. Step 6: Final answer
    x = 64,424.73

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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.