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Finding the Fourth Proportional to 612.30, 917.10 and 543.90

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Solution

The fourth proportional to 612.30, 917.10 and 543.90 is: 814.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    612.30 : 917.10 = 543.90 : x
  2. Step 2: Convert to fraction form
    612.30/917.10 = 543.90/x
  3. Step 3: Cross multiply
    612.30x = 917.10 × 543.90
  4. Step 4: Simplify right side
    612.30x = 498,810.69
  5. Step 5: Solve for x
    x = 498,810.69/612.30
  6. Step 6: Final answer
    x = 814.65

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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.