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Finding the Fourth Proportional to 807,871.80, 1,211,807.70 and 387,967.80

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Solution

The fourth proportional to 807,871.80, 1,211,807.70 and 387,967.80 is: 581,951.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    807,871.80 : 1,211,807.70 = 387,967.80 : x
  2. Step 2: Convert to fraction form
    807,871.80/1,211,807.70 = 387,967.80/x
  3. Step 3: Cross multiply
    807,871.80x = 1,211,807.70 × 387,967.80
  4. Step 4: Simplify right side
    807,871.80x = 470,142,367,392.06
  5. Step 5: Solve for x
    x = 470,142,367,392.06/807,871.80
  6. Step 6: Final answer
    x = 581,951.70

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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.