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Finding the Fourth Proportional to 39,407.72, 54,402.72 and 30,435.08

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Solution

The fourth proportional to 39,407.72, 54,402.72 and 30,435.08 is: 42,015.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    39,407.72 : 54,402.72 = 30,435.08 : x
  2. Step 2: Convert to fraction form
    39,407.72/54,402.72 = 30,435.08/x
  3. Step 3: Cross multiply
    39,407.72x = 54,402.72 × 30,435.08
  4. Step 4: Simplify right side
    39,407.72x = 1,655,751,135.42
  5. Step 5: Solve for x
    x = 1,655,751,135.42/39,407.72
  6. Step 6: Final answer
    x = 42,015.91

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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.