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Finding the Fourth Proportional to 393,985, 591,180.54 and 216,631.72

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Solution

The fourth proportional to 393,985, 591,180.54 and 216,631.72 is: 325,059.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    393,985 : 591,180.54 = 216,631.72 : x
  2. Step 2: Convert to fraction form
    393,985/591,180.54 = 216,631.72/x
  3. Step 3: Cross multiply
    393,985x = 591,180.54 × 216,631.72
  4. Step 4: Simplify right side
    393,985x = 128,068,457,210.73
  5. Step 5: Solve for x
    x = 128,068,457,210.73/393,985
  6. Step 6: Final answer
    x = 325,059.22

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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.