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Finding the Fourth Proportional to 612,072.60, 918,108.90 and 328,637.40

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Solution

The fourth proportional to 612,072.60, 918,108.90 and 328,637.40 is: 492,956.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,072.60 : 918,108.90 = 328,637.40 : x
  2. Step 2: Convert to fraction form
    612,072.60/918,108.90 = 328,637.40/x
  3. Step 3: Cross multiply
    612,072.60x = 918,108.90 × 328,637.40
  4. Step 4: Simplify right side
    612,072.60x = 301,724,921,812.86
  5. Step 5: Solve for x
    x = 301,724,921,812.86/612,072.60
  6. Step 6: Final answer
    x = 492,956.10

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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.