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Finding the Fourth Proportional to 426,875.31, 640,289.88 and 216,507.78

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Solution

The fourth proportional to 426,875.31, 640,289.88 and 216,507.78 is: 324,749.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    426,875.31 : 640,289.88 = 216,507.78 : x
  2. Step 2: Convert to fraction form
    426,875.31/640,289.88 = 216,507.78/x
  3. Step 3: Cross multiply
    426,875.31x = 640,289.88 × 216,507.78
  4. Step 4: Simplify right side
    426,875.31x = 138,627,740,475.27
  5. Step 5: Solve for x
    x = 138,627,740,475.27/426,875.31
  6. Step 6: Final answer
    x = 324,749.96

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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.