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Finding the Fourth Proportional to 528,156.28, 728,856.06 and 286,438.78

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Solution

The fourth proportional to 528,156.28, 728,856.06 and 286,438.78 is: 395,285.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    528,156.28 : 728,856.06 = 286,438.78 : x
  2. Step 2: Convert to fraction form
    528,156.28/728,856.06 = 286,438.78/x
  3. Step 3: Cross multiply
    528,156.28x = 728,856.06 × 286,438.78
  4. Step 4: Simplify right side
    528,156.28x = 208,772,640,622.01
  5. Step 5: Solve for x
    x = 208,772,640,622.01/528,156.28
  6. Step 6: Final answer
    x = 395,285.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.