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Finding the Fourth Proportional to 611,188.40, 916,221.30 and 211,549.69

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Solution

The fourth proportional to 611,188.40, 916,221.30 and 211,549.69 is: 317,130.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,188.40 : 916,221.30 = 211,549.69 : x
  2. Step 2: Convert to fraction form
    611,188.40/916,221.30 = 211,549.69/x
  3. Step 3: Cross multiply
    611,188.40x = 916,221.30 × 211,549.69
  4. Step 4: Simplify right side
    611,188.40x = 193,826,331,986.40
  5. Step 5: Solve for x
    x = 193,826,331,986.40/611,188.40
  6. Step 6: Final answer
    x = 317,130.25

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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.