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Finding the Fourth Proportional to 78,608.40, 108,483.96 and 75,785.76

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Solution

The fourth proportional to 78,608.40, 108,483.96 and 75,785.76 is: 104,588.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,608.40 : 108,483.96 = 75,785.76 : x
  2. Step 2: Convert to fraction form
    78,608.40/108,483.96 = 75,785.76/x
  3. Step 3: Cross multiply
    78,608.40x = 108,483.96 × 75,785.76
  4. Step 4: Simplify right side
    78,608.40x = 8,221,539,356.41
  5. Step 5: Solve for x
    x = 8,221,539,356.41/78,608.40
  6. Step 6: Final answer
    x = 104,588.56

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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.