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Finding the Fourth Proportional to 313,912.90, 470,978.70 and 136,547.20

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Solution

The fourth proportional to 313,912.90, 470,978.70 and 136,547.20 is: 204,868.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,912.90 : 470,978.70 = 136,547.20 : x
  2. Step 2: Convert to fraction form
    313,912.90/470,978.70 = 136,547.20/x
  3. Step 3: Cross multiply
    313,912.90x = 470,978.70 × 136,547.20
  4. Step 4: Simplify right side
    313,912.90x = 64,310,822,744.64
  5. Step 5: Solve for x
    x = 64,310,822,744.64/313,912.90
  6. Step 6: Final answer
    x = 204,868.37

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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.