Home / 665,438.10-996,844.95-398,405.40

Finding the Fourth Proportional to 665,438.10, 996,844.95 and 398,405.40

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Solution

The fourth proportional to 665,438.10, 996,844.95 and 398,405.40 is: 596,822.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,438.10 : 996,844.95 = 398,405.40 : x
  2. Step 2: Convert to fraction form
    665,438.10/996,844.95 = 398,405.40/x
  3. Step 3: Cross multiply
    665,438.10x = 996,844.95 × 398,405.40
  4. Step 4: Simplify right side
    665,438.10x = 397,148,411,042.73
  5. Step 5: Solve for x
    x = 397,148,411,042.73/665,438.10
  6. Step 6: Final answer
    x = 596,822.47

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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.