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Finding the Fourth Proportional to 77,187.60, 115,900.20 and 42,195.60

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Solution

The fourth proportional to 77,187.60, 115,900.20 and 42,195.60 is: 63,358.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,187.60 : 115,900.20 = 42,195.60 : x
  2. Step 2: Convert to fraction form
    77,187.60/115,900.20 = 42,195.60/x
  3. Step 3: Cross multiply
    77,187.60x = 115,900.20 × 42,195.60
  4. Step 4: Simplify right side
    77,187.60x = 4,890,478,479.12
  5. Step 5: Solve for x
    x = 4,890,478,479.12/77,187.60
  6. Step 6: Final answer
    x = 63,358.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.