Home / 715,821.40-987,839.96-389,135.04

Finding the Fourth Proportional to 715,821.40, 987,839.96 and 389,135.04

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Solution

The fourth proportional to 715,821.40, 987,839.96 and 389,135.04 is: 537,009.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    715,821.40 : 987,839.96 = 389,135.04 : x
  2. Step 2: Convert to fraction form
    715,821.40/987,839.96 = 389,135.04/x
  3. Step 3: Cross multiply
    715,821.40x = 987,839.96 × 389,135.04
  4. Step 4: Simplify right side
    715,821.40x = 384,403,142,348.20
  5. Step 5: Solve for x
    x = 384,403,142,348.20/715,821.40
  6. Step 6: Final answer
    x = 537,009.85

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1.5x scale

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.