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Finding the Fourth Proportional to 313,900.80, 470,678.40 and 103,430.40

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Solution

The fourth proportional to 313,900.80, 470,678.40 and 103,430.40 is: 155,088.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,900.80 : 470,678.40 = 103,430.40 : x
  2. Step 2: Convert to fraction form
    313,900.80/470,678.40 = 103,430.40/x
  3. Step 3: Cross multiply
    313,900.80x = 470,678.40 × 103,430.40
  4. Step 4: Simplify right side
    313,900.80x = 48,682,455,183.36
  5. Step 5: Solve for x
    x = 48,682,455,183.36/313,900.80
  6. Step 6: Final answer
    x = 155,088.66

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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.