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Finding the Fourth Proportional to 612,479.40, 918,841.74 and 342,990.78

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Solution

The fourth proportional to 612,479.40, 918,841.74 and 342,990.78 is: 514,554.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,479.40 : 918,841.74 = 342,990.78 : x
  2. Step 2: Convert to fraction form
    612,479.40/918,841.74 = 342,990.78/x
  3. Step 3: Cross multiply
    612,479.40x = 918,841.74 × 342,990.78
  4. Step 4: Simplify right side
    612,479.40x = 315,154,241,087.10
  5. Step 5: Solve for x
    x = 315,154,241,087.10/612,479.40
  6. Step 6: Final answer
    x = 514,554.84

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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.