Home / 312,647.20-431,601.91-209,459.07

Finding the Fourth Proportional to 312,647.20, 431,601.91 and 209,459.07

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Solution

The fourth proportional to 312,647.20, 431,601.91 and 209,459.07 is: 289,153.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    312,647.20 : 431,601.91 = 209,459.07 : x
  2. Step 2: Convert to fraction form
    312,647.20/431,601.91 = 209,459.07/x
  3. Step 3: Cross multiply
    312,647.20x = 431,601.91 × 209,459.07
  4. Step 4: Simplify right side
    312,647.20x = 90,402,934,155.18
  5. Step 5: Solve for x
    x = 90,402,934,155.18/312,647.20
  6. Step 6: Final answer
    x = 289,153.19

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.