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Finding the Fourth Proportional to 644,330.76, 889,147.68 and 386,350.10

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Solution

The fourth proportional to 644,330.76, 889,147.68 and 386,350.10 is: 533,145.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    644,330.76 : 889,147.68 = 386,350.10 : x
  2. Step 2: Convert to fraction form
    644,330.76/889,147.68 = 386,350.10/x
  3. Step 3: Cross multiply
    644,330.76x = 889,147.68 × 386,350.10
  4. Step 4: Simplify right side
    644,330.76x = 343,522,295,082.77
  5. Step 5: Solve for x
    x = 343,522,295,082.77/644,330.76
  6. Step 6: Final answer
    x = 533,145.89

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Half scale
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Double scale
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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.