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Finding the Fourth Proportional to 392,009.79, 540,400.87 and 277,085.66

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Solution

The fourth proportional to 392,009.79, 540,400.87 and 277,085.66 is: 381,973.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,009.79 : 540,400.87 = 277,085.66 : x
  2. Step 2: Convert to fraction form
    392,009.79/540,400.87 = 277,085.66/x
  3. Step 3: Cross multiply
    392,009.79x = 540,400.87 × 277,085.66
  4. Step 4: Simplify right side
    392,009.79x = 149,737,331,728.52
  5. Step 5: Solve for x
    x = 149,737,331,728.52/392,009.79
  6. Step 6: Final answer
    x = 381,973.45

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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.