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Finding the Fourth Proportional to 402,485.80, 603,728.70 and 215,861.80

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Solution

The fourth proportional to 402,485.80, 603,728.70 and 215,861.80 is: 323,792.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    402,485.80 : 603,728.70 = 215,861.80 : x
  2. Step 2: Convert to fraction form
    402,485.80/603,728.70 = 215,861.80/x
  3. Step 3: Cross multiply
    402,485.80x = 603,728.70 × 215,861.80
  4. Step 4: Simplify right side
    402,485.80x = 130,321,963,893.66
  5. Step 5: Solve for x
    x = 130,321,963,893.66/402,485.80
  6. Step 6: Final answer
    x = 323,792.70

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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.