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Finding the Fourth Proportional to 72,890.40, 109,303.20 and 28,502.40

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Solution

The fourth proportional to 72,890.40, 109,303.20 and 28,502.40 is: 42,740.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,890.40 : 109,303.20 = 28,502.40 : x
  2. Step 2: Convert to fraction form
    72,890.40/109,303.20 = 28,502.40/x
  3. Step 3: Cross multiply
    72,890.40x = 109,303.20 × 28,502.40
  4. Step 4: Simplify right side
    72,890.40x = 3,115,403,527.68
  5. Step 5: Solve for x
    x = 3,115,403,527.68/72,890.40
  6. Step 6: Final answer
    x = 42,740.93

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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.