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Finding the Fourth Proportional to 713,966.40, 985,266.18 and 391,679.55

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Solution

The fourth proportional to 713,966.40, 985,266.18 and 391,679.55 is: 540,513.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    713,966.40 : 985,266.18 = 391,679.55 : x
  2. Step 2: Convert to fraction form
    713,966.40/985,266.18 = 391,679.55/x
  3. Step 3: Cross multiply
    713,966.40x = 985,266.18 × 391,679.55
  4. Step 4: Simplify right side
    713,966.40x = 385,908,614,012.62
  5. Step 5: Solve for x
    x = 385,908,614,012.62/713,966.40
  6. Step 6: Final answer
    x = 540,513.69

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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.