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Finding the Fourth Proportional to 427,237.40, 640,856.10 and 206,053.40

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Solution

The fourth proportional to 427,237.40, 640,856.10 and 206,053.40 is: 309,080.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,237.40 : 640,856.10 = 206,053.40 : x
  2. Step 2: Convert to fraction form
    427,237.40/640,856.10 = 206,053.40/x
  3. Step 3: Cross multiply
    427,237.40x = 640,856.10 × 206,053.40
  4. Step 4: Simplify right side
    427,237.40x = 132,050,578,315.74
  5. Step 5: Solve for x
    x = 132,050,578,315.74/427,237.40
  6. Step 6: Final answer
    x = 309,080.10

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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.