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Finding the Fourth Proportional to 455,419.20, 683,128.80 and 139,875.60

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Solution

The fourth proportional to 455,419.20, 683,128.80 and 139,875.60 is: 209,813.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,419.20 : 683,128.80 = 139,875.60 : x
  2. Step 2: Convert to fraction form
    455,419.20/683,128.80 = 139,875.60/x
  3. Step 3: Cross multiply
    455,419.20x = 683,128.80 × 139,875.60
  4. Step 4: Simplify right side
    455,419.20x = 95,553,050,777.28
  5. Step 5: Solve for x
    x = 95,553,050,777.28/455,419.20
  6. Step 6: Final answer
    x = 209,813.40

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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.