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Finding the Fourth Proportional to 391,076.90, 539,407.26 and 358,915.16

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Solution

The fourth proportional to 391,076.90, 539,407.26 and 358,915.16 is: 495,046.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,076.90 : 539,407.26 = 358,915.16 : x
  2. Step 2: Convert to fraction form
    391,076.90/539,407.26 = 358,915.16/x
  3. Step 3: Cross multiply
    391,076.90x = 539,407.26 × 358,915.16
  4. Step 4: Simplify right side
    391,076.90x = 193,601,443,028.06
  5. Step 5: Solve for x
    x = 193,601,443,028.06/391,076.90
  6. Step 6: Final answer
    x = 495,046.99

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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.