Home / 387,585.05-534,808.77-221,987.21

Finding the Fourth Proportional to 387,585.05, 534,808.77 and 221,987.21

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Solution

The fourth proportional to 387,585.05, 534,808.77 and 221,987.21 is: 306,308.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    387,585.05 : 534,808.77 = 221,987.21 : x
  2. Step 2: Convert to fraction form
    387,585.05/534,808.77 = 221,987.21/x
  3. Step 3: Cross multiply
    387,585.05x = 534,808.77 × 221,987.21
  4. Step 4: Simplify right side
    387,585.05x = 118,720,703,926.43
  5. Step 5: Solve for x
    x = 118,720,703,926.43/387,585.05
  6. Step 6: Final answer
    x = 306,308.78

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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.