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Finding the Fourth Proportional to 427,312.70, 640,969.05 and 372,016.70

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Solution

The fourth proportional to 427,312.70, 640,969.05 and 372,016.70 is: 558,025.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,312.70 : 640,969.05 = 372,016.70 : x
  2. Step 2: Convert to fraction form
    427,312.70/640,969.05 = 372,016.70/x
  3. Step 3: Cross multiply
    427,312.70x = 640,969.05 × 372,016.70
  4. Step 4: Simplify right side
    427,312.70x = 238,451,190,783.14
  5. Step 5: Solve for x
    x = 238,451,190,783.14/427,312.70
  6. Step 6: Final answer
    x = 558,025.05

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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.