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Finding the Fourth Proportional to 611,110.20, 916,445.70 and 211,643.40

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Solution

The fourth proportional to 611,110.20, 916,445.70 and 211,643.40 is: 317,389.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,110.20 : 916,445.70 = 211,643.40 : x
  2. Step 2: Convert to fraction form
    611,110.20/916,445.70 = 211,643.40/x
  3. Step 3: Cross multiply
    611,110.20x = 916,445.70 × 211,643.40
  4. Step 4: Simplify right side
    611,110.20x = 193,959,683,863.38
  5. Step 5: Solve for x
    x = 193,959,683,863.38/611,110.20
  6. Step 6: Final answer
    x = 317,389.05

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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.