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Finding the Fourth Proportional to 391,308.08, 540,005.40 and 221,542.40

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Solution

The fourth proportional to 391,308.08, 540,005.40 and 221,542.40 is: 305,728.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,308.08 : 540,005.40 = 221,542.40 : x
  2. Step 2: Convert to fraction form
    391,308.08/540,005.40 = 221,542.40/x
  3. Step 3: Cross multiply
    391,308.08x = 540,005.40 × 221,542.40
  4. Step 4: Simplify right side
    391,308.08x = 119,634,092,328.96
  5. Step 5: Solve for x
    x = 119,634,092,328.96/391,308.08
  6. Step 6: Final answer
    x = 305,728.65

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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.