Home / 280,723.39-421,111.65-78,332.92

Finding the Fourth Proportional to 280,723.39, 421,111.65 and 78,332.92

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Solution

The fourth proportional to 280,723.39, 421,111.65 and 78,332.92 is: 117,506.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    280,723.39 : 421,111.65 = 78,332.92 : x
  2. Step 2: Convert to fraction form
    280,723.39/421,111.65 = 78,332.92/x
  3. Step 3: Cross multiply
    280,723.39x = 421,111.65 × 78,332.92
  4. Step 4: Simplify right side
    280,723.39x = 32,986,905,190.52
  5. Step 5: Solve for x
    x = 32,986,905,190.52/280,723.39
  6. Step 6: Final answer
    x = 117,506.79

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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.