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Finding the Fourth Proportional to 612,095.40, 918,143.10 and 423,138.60

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Solution

The fourth proportional to 612,095.40, 918,143.10 and 423,138.60 is: 634,707.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    612,095.40 : 918,143.10 = 423,138.60 : x
  2. Step 2: Convert to fraction form
    612,095.40/918,143.10 = 423,138.60/x
  3. Step 3: Cross multiply
    612,095.40x = 918,143.10 × 423,138.60
  4. Step 4: Simplify right side
    612,095.40x = 388,501,785,933.66
  5. Step 5: Solve for x
    x = 388,501,785,933.66/612,095.40
  6. Step 6: Final answer
    x = 634,707.90

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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.