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Finding the Fourth Proportional to 391,320.60, 540,024.42 and 221,587.80

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Solution

The fourth proportional to 391,320.60, 540,024.42 and 221,587.80 is: 305,792.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,320.60 : 540,024.42 = 221,587.80 : x
  2. Step 2: Convert to fraction form
    391,320.60/540,024.42 = 221,587.80/x
  3. Step 3: Cross multiply
    391,320.60x = 540,024.42 × 221,587.80
  4. Step 4: Simplify right side
    391,320.60x = 119,662,823,174.08
  5. Step 5: Solve for x
    x = 119,662,823,174.08/391,320.60
  6. Step 6: Final answer
    x = 305,792.29

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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.