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Finding the Fourth Proportional to 78,320.57, 108,079.48 and 42,509.81

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Solution

The fourth proportional to 78,320.57, 108,079.48 and 42,509.81 is: 58,661.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,320.57 : 108,079.48 = 42,509.81 : x
  2. Step 2: Convert to fraction form
    78,320.57/108,079.48 = 42,509.81/x
  3. Step 3: Cross multiply
    78,320.57x = 108,079.48 × 42,509.81
  4. Step 4: Simplify right side
    78,320.57x = 4,594,438,483.03
  5. Step 5: Solve for x
    x = 4,594,438,483.03/78,320.57
  6. Step 6: Final answer
    x = 58,661.97

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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.