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Finding the Fourth Proportional to 719,154.89, 992,457.58 and 392,485.78

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Solution

The fourth proportional to 719,154.89, 992,457.58 and 392,485.78 is: 541,643.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    719,154.89 : 992,457.58 = 392,485.78 : x
  2. Step 2: Convert to fraction form
    719,154.89/992,457.58 = 392,485.78/x
  3. Step 3: Cross multiply
    719,154.89x = 992,457.58 × 392,485.78
  4. Step 4: Simplify right side
    719,154.89x = 389,525,487,634.46
  5. Step 5: Solve for x
    x = 389,525,487,634.46/719,154.89
  6. Step 6: Final answer
    x = 541,643.38

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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.