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Finding the Fourth Proportional to 385,681.80, 578,522.70 and 136,331.40

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Solution

The fourth proportional to 385,681.80, 578,522.70 and 136,331.40 is: 204,497.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,681.80 : 578,522.70 = 136,331.40 : x
  2. Step 2: Convert to fraction form
    385,681.80/578,522.70 = 136,331.40/x
  3. Step 3: Cross multiply
    385,681.80x = 578,522.70 × 136,331.40
  4. Step 4: Simplify right side
    385,681.80x = 78,870,809,622.78
  5. Step 5: Solve for x
    x = 78,870,809,622.78/385,681.80
  6. Step 6: Final answer
    x = 204,497.10

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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.