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Finding the Fourth Proportional to 611,999.70, 917,999.55 and 213,090.90

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Solution

The fourth proportional to 611,999.70, 917,999.55 and 213,090.90 is: 319,636.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,999.70 : 917,999.55 = 213,090.90 : x
  2. Step 2: Convert to fraction form
    611,999.70/917,999.55 = 213,090.90/x
  3. Step 3: Cross multiply
    611,999.70x = 917,999.55 × 213,090.90
  4. Step 4: Simplify right side
    611,999.70x = 195,617,350,309.10
  5. Step 5: Solve for x
    x = 195,617,350,309.10/611,999.70
  6. Step 6: Final answer
    x = 319,636.35

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Similar ratio
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1.5x scale

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.