Home / 640,344.89-961,056.18-320,400.77

Finding the Fourth Proportional to 640,344.89, 961,056.18 and 320,400.77

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Solution

The fourth proportional to 640,344.89, 961,056.18 and 320,400.77 is: 480,870.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,344.89 : 961,056.18 = 320,400.77 : x
  2. Step 2: Convert to fraction form
    640,344.89/961,056.18 = 320,400.77/x
  3. Step 3: Cross multiply
    640,344.89x = 961,056.18 × 320,400.77
  4. Step 4: Simplify right side
    640,344.89x = 307,923,140,085.26
  5. Step 5: Solve for x
    x = 307,923,140,085.26/640,344.89
  6. Step 6: Final answer
    x = 480,870.77

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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.