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Finding the Fourth Proportional to 718,247.87, 991,156.53 and 391,554.11

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Solution

The fourth proportional to 718,247.87, 991,156.53 and 391,554.11 is: 540,330.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,247.87 : 991,156.53 = 391,554.11 : x
  2. Step 2: Convert to fraction form
    718,247.87/991,156.53 = 391,554.11/x
  3. Step 3: Cross multiply
    718,247.87x = 991,156.53 × 391,554.11
  4. Step 4: Simplify right side
    718,247.87x = 388,091,416,921.06
  5. Step 5: Solve for x
    x = 388,091,416,921.06/718,247.87
  6. Step 6: Final answer
    x = 540,330.76

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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.