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Finding the Fourth Proportional to 310,217.80, 465,326.70 and 85,612.90

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Solution

The fourth proportional to 310,217.80, 465,326.70 and 85,612.90 is: 128,419.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    310,217.80 : 465,326.70 = 85,612.90 : x
  2. Step 2: Convert to fraction form
    310,217.80/465,326.70 = 85,612.90/x
  3. Step 3: Cross multiply
    310,217.80x = 465,326.70 × 85,612.90
  4. Step 4: Simplify right side
    310,217.80x = 39,837,968,234.43
  5. Step 5: Solve for x
    x = 39,837,968,234.43/310,217.80
  6. Step 6: Final answer
    x = 128,419.35

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Similar ratio
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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.