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Finding the Fourth Proportional to 612,478.65, 918,840.61 and 342,990.03

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Solution

The fourth proportional to 612,478.65, 918,840.61 and 342,990.03 is: 514,553.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,478.65 : 918,840.61 = 342,990.03 : x
  2. Step 2: Convert to fraction form
    612,478.65/918,840.61 = 342,990.03/x
  3. Step 3: Cross multiply
    612,478.65x = 918,840.61 × 342,990.03
  4. Step 4: Simplify right side
    612,478.65x = 315,153,166,451.92
  5. Step 5: Solve for x
    x = 315,153,166,451.92/612,478.65
  6. Step 6: Final answer
    x = 514,553.72

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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.