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Finding the Fourth Proportional to 78,465.94, 108,285.12 and 42,658.36

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Solution

The fourth proportional to 78,465.94, 108,285.12 and 42,658.36 is: 58,869.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,465.94 : 108,285.12 = 42,658.36 : x
  2. Step 2: Convert to fraction form
    78,465.94/108,285.12 = 42,658.36/x
  3. Step 3: Cross multiply
    78,465.94x = 108,285.12 × 42,658.36
  4. Step 4: Simplify right side
    78,465.94x = 4,619,265,631.60
  5. Step 5: Solve for x
    x = 4,619,265,631.60/78,465.94
  6. Step 6: Final answer
    x = 58,869.69

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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.