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Finding the Fourth Proportional to 147,777.40, 221,666.10 and 85,415.80

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Solution

The fourth proportional to 147,777.40, 221,666.10 and 85,415.80 is: 128,123.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    147,777.40 : 221,666.10 = 85,415.80 : x
  2. Step 2: Convert to fraction form
    147,777.40/221,666.10 = 85,415.80/x
  3. Step 3: Cross multiply
    147,777.40x = 221,666.10 × 85,415.80
  4. Step 4: Simplify right side
    147,777.40x = 18,933,787,264.38
  5. Step 5: Solve for x
    x = 18,933,787,264.38/147,777.40
  6. Step 6: Final answer
    x = 128,123.70

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.