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Finding the Fourth Proportional to 455,421.80, 683,132.70 and 189,045.20

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Solution

The fourth proportional to 455,421.80, 683,132.70 and 189,045.20 is: 283,567.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,421.80 : 683,132.70 = 189,045.20 : x
  2. Step 2: Convert to fraction form
    455,421.80/683,132.70 = 189,045.20/x
  3. Step 3: Cross multiply
    455,421.80x = 683,132.70 × 189,045.20
  4. Step 4: Simplify right side
    455,421.80x = 129,142,957,898.04
  5. Step 5: Solve for x
    x = 129,142,957,898.04/455,421.80
  6. Step 6: Final answer
    x = 283,567.80

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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.