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Finding the Fourth Proportional to 455,528.70, 683,325.45 and 139,985.10

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Solution

The fourth proportional to 455,528.70, 683,325.45 and 139,985.10 is: 209,987.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    455,528.70 : 683,325.45 = 139,985.10 : x
  2. Step 2: Convert to fraction form
    455,528.70/683,325.45 = 139,985.10/x
  3. Step 3: Cross multiply
    455,528.70x = 683,325.45 × 139,985.10
  4. Step 4: Simplify right side
    455,528.70x = 95,655,381,450.80
  5. Step 5: Solve for x
    x = 95,655,381,450.80/455,528.70
  6. Step 6: Final answer
    x = 209,987.61

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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.