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Finding the Fourth Proportional to 455,431.80, 683,147.70 and 139,904.40

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Solution

The fourth proportional to 455,431.80, 683,147.70 and 139,904.40 is: 209,856.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,431.80 : 683,147.70 = 139,904.40 : x
  2. Step 2: Convert to fraction form
    455,431.80/683,147.70 = 139,904.40/x
  3. Step 3: Cross multiply
    455,431.80x = 683,147.70 × 139,904.40
  4. Step 4: Simplify right side
    455,431.80x = 95,575,369,079.88
  5. Step 5: Solve for x
    x = 95,575,369,079.88/455,431.80
  6. Step 6: Final answer
    x = 209,856.60

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Similar ratio
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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.