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Finding the Fourth Proportional to 718,295.95, 991,218.55 and 391,601.89

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Solution

The fourth proportional to 718,295.95, 991,218.55 and 391,601.89 is: 540,394.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,295.95 : 991,218.55 = 391,601.89 : x
  2. Step 2: Convert to fraction form
    718,295.95/991,218.55 = 391,601.89/x
  3. Step 3: Cross multiply
    718,295.95x = 991,218.55 × 391,601.89
  4. Step 4: Simplify right side
    718,295.95x = 388,163,050,668.96
  5. Step 5: Solve for x
    x = 388,163,050,668.96/718,295.95
  6. Step 6: Final answer
    x = 540,394.32

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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.