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Finding the Fourth Proportional to 72,918.40, 109,345.20 and 28,530.40

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Solution

The fourth proportional to 72,918.40, 109,345.20 and 28,530.40 is: 42,782.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,918.40 : 109,345.20 = 28,530.40 : x
  2. Step 2: Convert to fraction form
    72,918.40/109,345.20 = 28,530.40/x
  3. Step 3: Cross multiply
    72,918.40x = 109,345.20 × 28,530.40
  4. Step 4: Simplify right side
    72,918.40x = 3,119,662,294.08
  5. Step 5: Solve for x
    x = 3,119,662,294.08/72,918.40
  6. Step 6: Final answer
    x = 42,782.92

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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.