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Finding the Fourth Proportional to 651,922.20, 978,320.70 and 385,399.80

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Solution

The fourth proportional to 651,922.20, 978,320.70 and 385,399.80 is: 578,358.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,922.20 : 978,320.70 = 385,399.80 : x
  2. Step 2: Convert to fraction form
    651,922.20/978,320.70 = 385,399.80/x
  3. Step 3: Cross multiply
    651,922.20x = 978,320.70 × 385,399.80
  4. Step 4: Simplify right side
    651,922.20x = 377,044,602,115.86
  5. Step 5: Solve for x
    x = 377,044,602,115.86/651,922.20
  6. Step 6: Final answer
    x = 578,358.28

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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.