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Finding the Fourth Proportional to 368,915.21, 509,139.30 and 215,944.13

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Solution

The fourth proportional to 368,915.21, 509,139.30 and 215,944.13 is: 298,024.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    368,915.21 : 509,139.30 = 215,944.13 : x
  2. Step 2: Convert to fraction form
    368,915.21/509,139.30 = 215,944.13/x
  3. Step 3: Cross multiply
    368,915.21x = 509,139.30 × 215,944.13
  4. Step 4: Simplify right side
    368,915.21x = 109,945,642,406.04
  5. Step 5: Solve for x
    x = 109,945,642,406.04/368,915.21
  6. Step 6: Final answer
    x = 298,024.15

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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.