Home / 645,621.12-890,913.60-359,121.60

Finding the Fourth Proportional to 645,621.12, 890,913.60 and 359,121.60

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Solution

The fourth proportional to 645,621.12, 890,913.60 and 359,121.60 is: 495,563.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    645,621.12 : 890,913.60 = 359,121.60 : x
  2. Step 2: Convert to fraction form
    645,621.12/890,913.60 = 359,121.60/x
  3. Step 3: Cross multiply
    645,621.12x = 890,913.60 × 359,121.60
  4. Step 4: Simplify right side
    645,621.12x = 319,946,317,493.76
  5. Step 5: Solve for x
    x = 319,946,317,493.76/645,621.12
  6. Step 6: Final answer
    x = 495,563.59

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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.