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Finding the Fourth Proportional to 612,211.30, 916,502.55 and 455,136.10

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Solution

The fourth proportional to 612,211.30, 916,502.55 and 455,136.10 is: 681,355.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,211.30 : 916,502.55 = 455,136.10 : x
  2. Step 2: Convert to fraction form
    612,211.30/916,502.55 = 455,136.10/x
  3. Step 3: Cross multiply
    612,211.30x = 916,502.55 × 455,136.10
  4. Step 4: Simplify right side
    612,211.30x = 417,133,396,247.06
  5. Step 5: Solve for x
    x = 417,133,396,247.06/612,211.30
  6. Step 6: Final answer
    x = 681,355.27

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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.