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Finding the Fourth Proportional to 385,751.80, 578,627.70 and 136,401.40

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Solution

The fourth proportional to 385,751.80, 578,627.70 and 136,401.40 is: 204,602.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    385,751.80 : 578,627.70 = 136,401.40 : x
  2. Step 2: Convert to fraction form
    385,751.80/578,627.70 = 136,401.40/x
  3. Step 3: Cross multiply
    385,751.80x = 578,627.70 × 136,401.40
  4. Step 4: Simplify right side
    385,751.80x = 78,925,628,358.78
  5. Step 5: Solve for x
    x = 78,925,628,358.78/385,751.80
  6. Step 6: Final answer
    x = 204,602.10

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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.