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Finding the Fourth Proportional to 30,390.42, 45,568.53 and 20,913.87

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Solution

The fourth proportional to 30,390.42, 45,568.53 and 20,913.87 is: 31,359.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,390.42 : 45,568.53 = 20,913.87 : x
  2. Step 2: Convert to fraction form
    30,390.42/45,568.53 = 20,913.87/x
  3. Step 3: Cross multiply
    30,390.42x = 45,568.53 × 20,913.87
  4. Step 4: Simplify right side
    30,390.42x = 953,014,312.51
  5. Step 5: Solve for x
    x = 953,014,312.51/30,390.42
  6. Step 6: Final answer
    x = 31,359.04

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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.