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Finding the Fourth Proportional to 85,851.70, 128,777.55 and 35,915.20

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Solution

The fourth proportional to 85,851.70, 128,777.55 and 35,915.20 is: 53,872.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,851.70 : 128,777.55 = 35,915.20 : x
  2. Step 2: Convert to fraction form
    85,851.70/128,777.55 = 35,915.20/x
  3. Step 3: Cross multiply
    85,851.70x = 128,777.55 × 35,915.20
  4. Step 4: Simplify right side
    85,851.70x = 4,625,071,463.76
  5. Step 5: Solve for x
    x = 4,625,071,463.76/85,851.70
  6. Step 6: Final answer
    x = 53,872.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.