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Finding the Fourth Proportional to 313,992.40, 470,988.60 and 258,363.40

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Solution

The fourth proportional to 313,992.40, 470,988.60 and 258,363.40 is: 387,545.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    313,992.40 : 470,988.60 = 258,363.40 : x
  2. Step 2: Convert to fraction form
    313,992.40/470,988.60 = 258,363.40/x
  3. Step 3: Cross multiply
    313,992.40x = 470,988.60 × 258,363.40
  4. Step 4: Simplify right side
    313,992.40x = 121,686,216,057.24
  5. Step 5: Solve for x
    x = 121,686,216,057.24/313,992.40
  6. Step 6: Final answer
    x = 387,545.10

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1.5x scale

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.