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Finding the Fourth Proportional to 666,412.34, 919,356.86 and 390,630.39

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Solution

The fourth proportional to 666,412.34, 919,356.86 and 390,630.39 is: 538,898.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,412.34 : 919,356.86 = 390,630.39 : x
  2. Step 2: Convert to fraction form
    666,412.34/919,356.86 = 390,630.39/x
  3. Step 3: Cross multiply
    666,412.34x = 919,356.86 × 390,630.39
  4. Step 4: Simplify right side
    666,412.34x = 359,128,726,817.82
  5. Step 5: Solve for x
    x = 359,128,726,817.82/666,412.34
  6. Step 6: Final answer
    x = 538,898.68

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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.