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Finding the Fourth Proportional to 713,861.64, 985,142.16 and 391,588.20

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Solution

The fourth proportional to 713,861.64, 985,142.16 and 391,588.20 is: 540,398.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,861.64 : 985,142.16 = 391,588.20 : x
  2. Step 2: Convert to fraction form
    713,861.64/985,142.16 = 391,588.20/x
  3. Step 3: Cross multiply
    713,861.64x = 985,142.16 × 391,588.20
  4. Step 4: Simplify right side
    713,861.64x = 385,770,045,178.51
  5. Step 5: Solve for x
    x = 385,770,045,178.51/713,861.64
  6. Step 6: Final answer
    x = 540,398.90

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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.