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Finding the Fourth Proportional to 391,089.78, 539,595.30 and 221,320.26

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Solution

The fourth proportional to 391,089.78, 539,595.30 and 221,320.26 is: 305,360.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,089.78 : 539,595.30 = 221,320.26 : x
  2. Step 2: Convert to fraction form
    391,089.78/539,595.30 = 221,320.26/x
  3. Step 3: Cross multiply
    391,089.78x = 539,595.30 × 221,320.26
  4. Step 4: Simplify right side
    391,089.78x = 119,423,372,090.78
  5. Step 5: Solve for x
    x = 119,423,372,090.78/391,089.78
  6. Step 6: Final answer
    x = 305,360.50

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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.