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Finding the Fourth Proportional to 391,017.17, 539,478.30 and 218,909.84

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Solution

The fourth proportional to 391,017.17, 539,478.30 and 218,909.84 is: 302,025.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,017.17 : 539,478.30 = 218,909.84 : x
  2. Step 2: Convert to fraction form
    391,017.17/539,478.30 = 218,909.84/x
  3. Step 3: Cross multiply
    391,017.17x = 539,478.30 × 218,909.84
  4. Step 4: Simplify right side
    391,017.17x = 118,097,108,878.87
  5. Step 5: Solve for x
    x = 118,097,108,878.87/391,017.17
  6. Step 6: Final answer
    x = 302,025.38

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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.