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Finding the Fourth Proportional to 272,785.19, 408,915.34 and 139,728.11

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Solution

The fourth proportional to 272,785.19, 408,915.34 and 139,728.11 is: 209,457.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    272,785.19 : 408,915.34 = 139,728.11 : x
  2. Step 2: Convert to fraction form
    272,785.19/408,915.34 = 139,728.11/x
  3. Step 3: Cross multiply
    272,785.19x = 408,915.34 × 139,728.11
  4. Step 4: Simplify right side
    272,785.19x = 57,136,965,214.31
  5. Step 5: Solve for x
    x = 57,136,965,214.31/272,785.19
  6. Step 6: Final answer
    x = 209,457.73

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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.