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Finding the Fourth Proportional to 661,778.61, 992,574.20 and 212,440.32

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Solution

The fourth proportional to 661,778.61, 992,574.20 and 212,440.32 is: 318,630.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,778.61 : 992,574.20 = 212,440.32 : x
  2. Step 2: Convert to fraction form
    661,778.61/992,574.20 = 212,440.32/x
  3. Step 3: Cross multiply
    661,778.61x = 992,574.20 × 212,440.32
  4. Step 4: Simplify right side
    661,778.61x = 210,862,781,202.85
  5. Step 5: Solve for x
    x = 210,862,781,202.85/661,778.61
  6. Step 6: Final answer
    x = 318,630.40

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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.