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Finding the Fourth Proportional to 651,891.20, 978,412.80 and 385,318.40

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Solution

The fourth proportional to 651,891.20, 978,412.80 and 385,318.40 is: 578,318.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    651,891.20 : 978,412.80 = 385,318.40 : x
  2. Step 2: Convert to fraction form
    651,891.20/978,412.80 = 385,318.40/x
  3. Step 3: Cross multiply
    651,891.20x = 978,412.80 × 385,318.40
  4. Step 4: Simplify right side
    651,891.20x = 377,000,454,635.52
  5. Step 5: Solve for x
    x = 377,000,454,635.52/651,891.20
  6. Step 6: Final answer
    x = 578,318.06

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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.