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Finding the Fourth Proportional to 719,665.84, 993,142.29 and 392,985.70

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Solution

The fourth proportional to 719,665.84, 993,142.29 and 392,985.70 is: 542,322.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,665.84 : 993,142.29 = 392,985.70 : x
  2. Step 2: Convert to fraction form
    719,665.84/993,142.29 = 392,985.70/x
  3. Step 3: Cross multiply
    719,665.84x = 993,142.29 × 392,985.70
  4. Step 4: Simplify right side
    719,665.84x = 390,290,719,991.27
  5. Step 5: Solve for x
    x = 390,290,719,991.27/719,665.84
  6. Step 6: Final answer
    x = 542,322.14

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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.