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Finding the Fourth Proportional to 72,709.68, 109,036.53 and 28,330.59

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Solution

The fourth proportional to 72,709.68, 109,036.53 and 28,330.59 is: 42,484.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,709.68 : 109,036.53 = 28,330.59 : x
  2. Step 2: Convert to fraction form
    72,709.68/109,036.53 = 28,330.59/x
  3. Step 3: Cross multiply
    72,709.68x = 109,036.53 × 28,330.59
  4. Step 4: Simplify right side
    72,709.68x = 3,089,069,226.45
  5. Step 5: Solve for x
    x = 3,089,069,226.45/72,709.68
  6. Step 6: Final answer
    x = 42,484.98

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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.