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Finding the Fourth Proportional to 73,009.40, 109,433.10 and 28,621.40

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Solution

The fourth proportional to 73,009.40, 109,433.10 and 28,621.40 is: 42,900.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    73,009.40 : 109,433.10 = 28,621.40 : x
  2. Step 2: Convert to fraction form
    73,009.40/109,433.10 = 28,621.40/x
  3. Step 3: Cross multiply
    73,009.40x = 109,433.10 × 28,621.40
  4. Step 4: Simplify right side
    73,009.40x = 3,132,128,528.34
  5. Step 5: Solve for x
    x = 3,132,128,528.34/73,009.40
  6. Step 6: Final answer
    x = 42,900.35

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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.