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Finding the Fourth Proportional to 703,912.80, 971,387 and 397,983.90

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Solution

The fourth proportional to 703,912.80, 971,387 and 397,983.90 is: 549,210.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    703,912.80 : 971,387 = 397,983.90 : x
  2. Step 2: Convert to fraction form
    703,912.80/971,387 = 397,983.90/x
  3. Step 3: Cross multiply
    703,912.80x = 971,387 × 397,983.90
  4. Step 4: Simplify right side
    703,912.80x = 386,596,386,669.30
  5. Step 5: Solve for x
    x = 386,596,386,669.30/703,912.80
  6. Step 6: Final answer
    x = 549,210.62

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.