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Finding the Fourth Proportional to 391,603.97, 540,403.71 and 217,173.16

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Solution

The fourth proportional to 391,603.97, 540,403.71 and 217,173.16 is: 299,693.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,603.97 : 540,403.71 = 217,173.16 : x
  2. Step 2: Convert to fraction form
    391,603.97/540,403.71 = 217,173.16/x
  3. Step 3: Cross multiply
    391,603.97x = 540,403.71 × 217,173.16
  4. Step 4: Simplify right side
    391,603.97x = 117,361,181,376.42
  5. Step 5: Solve for x
    x = 117,361,181,376.42/391,603.97
  6. Step 6: Final answer
    x = 299,693.54

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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.