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Finding the Fourth Proportional to 78,261.70, 108,001.20 and 42,451.60

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Solution

The fourth proportional to 78,261.70, 108,001.20 and 42,451.60 is: 58,583.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,261.70 : 108,001.20 = 42,451.60 : x
  2. Step 2: Convert to fraction form
    78,261.70/108,001.20 = 42,451.60/x
  3. Step 3: Cross multiply
    78,261.70x = 108,001.20 × 42,451.60
  4. Step 4: Simplify right side
    78,261.70x = 4,584,823,741.92
  5. Step 5: Solve for x
    x = 4,584,823,741.92/78,261.70
  6. Step 6: Final answer
    x = 58,583.24

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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.