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Finding the Fourth Proportional to 72,368.48, 108,640.20 and 42,975.20

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Solution

The fourth proportional to 72,368.48, 108,640.20 and 42,975.20 is: 64,514.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,368.48 : 108,640.20 = 42,975.20 : x
  2. Step 2: Convert to fraction form
    72,368.48/108,640.20 = 42,975.20/x
  3. Step 3: Cross multiply
    72,368.48x = 108,640.20 × 42,975.20
  4. Step 4: Simplify right side
    72,368.48x = 4,668,834,323.04
  5. Step 5: Solve for x
    x = 4,668,834,323.04/72,368.48
  6. Step 6: Final answer
    x = 64,514.75

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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.