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Finding the Fourth Proportional to 485,065.32, 727,971.60 and 390,526.80

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Solution

The fourth proportional to 485,065.32, 727,971.60 and 390,526.80 is: 586,091.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    485,065.32 : 727,971.60 = 390,526.80 : x
  2. Step 2: Convert to fraction form
    485,065.32/727,971.60 = 390,526.80/x
  3. Step 3: Cross multiply
    485,065.32x = 727,971.60 × 390,526.80
  4. Step 4: Simplify right side
    485,065.32x = 284,292,419,438.88
  5. Step 5: Solve for x
    x = 284,292,419,438.88/485,065.32
  6. Step 6: Final answer
    x = 586,091.00

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.