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Finding the Fourth Proportional to 385,389.60, 578,084.40 and 207,805.20

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Solution

The fourth proportional to 385,389.60, 578,084.40 and 207,805.20 is: 311,707.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,389.60 : 578,084.40 = 207,805.20 : x
  2. Step 2: Convert to fraction form
    385,389.60/578,084.40 = 207,805.20/x
  3. Step 3: Cross multiply
    385,389.60x = 578,084.40 × 207,805.20
  4. Step 4: Simplify right side
    385,389.60x = 120,128,944,358.88
  5. Step 5: Solve for x
    x = 120,128,944,358.88/385,389.60
  6. Step 6: Final answer
    x = 311,707.80

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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.