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Finding the Fourth Proportional to 320,415.10, 480,622.65 and 83,781.70

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Solution

The fourth proportional to 320,415.10, 480,622.65 and 83,781.70 is: 125,672.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    320,415.10 : 480,622.65 = 83,781.70 : x
  2. Step 2: Convert to fraction form
    320,415.10/480,622.65 = 83,781.70/x
  3. Step 3: Cross multiply
    320,415.10x = 480,622.65 × 83,781.70
  4. Step 4: Simplify right side
    320,415.10x = 40,267,382,675.51
  5. Step 5: Solve for x
    x = 40,267,382,675.51/320,415.10
  6. Step 6: Final answer
    x = 125,672.55

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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.