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Finding the Fourth Proportional to 78,628.71, 108,509.58 and 42,820.68

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Solution

The fourth proportional to 78,628.71, 108,509.58 and 42,820.68 is: 59,093.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,628.71 : 108,509.58 = 42,820.68 : x
  2. Step 2: Convert to fraction form
    78,628.71/108,509.58 = 42,820.68/x
  3. Step 3: Cross multiply
    78,628.71x = 108,509.58 × 42,820.68
  4. Step 4: Simplify right side
    78,628.71x = 4,646,454,002.11
  5. Step 5: Solve for x
    x = 4,646,454,002.11/78,628.71
  6. Step 6: Final answer
    x = 59,093.61

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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.