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Finding the Fourth Proportional to 255,990.60, 383,988.78 and 78,499.08

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Solution

The fourth proportional to 255,990.60, 383,988.78 and 78,499.08 is: 117,749.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    255,990.60 : 383,988.78 = 78,499.08 : x
  2. Step 2: Convert to fraction form
    255,990.60/383,988.78 = 78,499.08/x
  3. Step 3: Cross multiply
    255,990.60x = 383,988.78 × 78,499.08
  4. Step 4: Simplify right side
    255,990.60x = 30,142,765,960.32
  5. Step 5: Solve for x
    x = 30,142,765,960.32/255,990.60
  6. Step 6: Final answer
    x = 117,749.50

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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.