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Finding the Fourth Proportional to 391,309.08, 540,006.78 and 221,543.40

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Solution

The fourth proportional to 391,309.08, 540,006.78 and 221,543.40 is: 305,730.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,309.08 : 540,006.78 = 221,543.40 : x
  2. Step 2: Convert to fraction form
    391,309.08/540,006.78 = 221,543.40/x
  3. Step 3: Cross multiply
    391,309.08x = 540,006.78 × 221,543.40
  4. Step 4: Simplify right side
    391,309.08x = 119,634,938,064.25
  5. Step 5: Solve for x
    x = 119,634,938,064.25/391,309.08
  6. Step 6: Final answer
    x = 305,730.03

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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.