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Finding the Fourth Proportional to 686,445.76, 947,235.60 and 392,094.13

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Solution

The fourth proportional to 686,445.76, 947,235.60 and 392,094.13 is: 541,055.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    686,445.76 : 947,235.60 = 392,094.13 : x
  2. Step 2: Convert to fraction form
    686,445.76/947,235.60 = 392,094.13/x
  3. Step 3: Cross multiply
    686,445.76x = 947,235.60 × 392,094.13
  4. Step 4: Simplify right side
    686,445.76x = 371,405,520,881.20
  5. Step 5: Solve for x
    x = 371,405,520,881.20/686,445.76
  6. Step 6: Final answer
    x = 541,055.89

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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.