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Finding the Fourth Proportional to 391,686.25, 540,548.90 and 221,975.05

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Solution

The fourth proportional to 391,686.25, 540,548.90 and 221,975.05 is: 306,337.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,686.25 : 540,548.90 = 221,975.05 : x
  2. Step 2: Convert to fraction form
    391,686.25/540,548.90 = 221,975.05/x
  3. Step 3: Cross multiply
    391,686.25x = 540,548.90 × 221,975.05
  4. Step 4: Simplify right side
    391,686.25x = 119,988,367,995.07
  5. Step 5: Solve for x
    x = 119,988,367,995.07/391,686.25
  6. Step 6: Final answer
    x = 306,337.96

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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.