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Finding the Fourth Proportional to 30,621, 42,125.76 and 29,308.80

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Solution

The fourth proportional to 30,621, 42,125.76 and 29,308.80 is: 40,320.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,621 : 42,125.76 = 29,308.80 : x
  2. Step 2: Convert to fraction form
    30,621/42,125.76 = 29,308.80/x
  3. Step 3: Cross multiply
    30,621x = 42,125.76 × 29,308.80
  4. Step 4: Simplify right side
    30,621x = 1,234,655,474.69
  5. Step 5: Solve for x
    x = 1,234,655,474.69/30,621
  6. Step 6: Final answer
    x = 40,320.55

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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.