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Finding the Fourth Proportional to 78,520.57, 108,358.95 and 42,710.56

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Solution

The fourth proportional to 78,520.57, 108,358.95 and 42,710.56 is: 58,940.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,520.57 : 108,358.95 = 42,710.56 : x
  2. Step 2: Convert to fraction form
    78,520.57/108,358.95 = 42,710.56/x
  3. Step 3: Cross multiply
    78,520.57x = 108,358.95 × 42,710.56
  4. Step 4: Simplify right side
    78,520.57x = 4,628,071,435.51
  5. Step 5: Solve for x
    x = 4,628,071,435.51/78,520.57
  6. Step 6: Final answer
    x = 58,940.88

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1.5x scale

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.