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Finding the Fourth Proportional to 390,801.60, 586,202.40 and 354,643.20

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Solution

The fourth proportional to 390,801.60, 586,202.40 and 354,643.20 is: 531,964.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    390,801.60 : 586,202.40 = 354,643.20 : x
  2. Step 2: Convert to fraction form
    390,801.60/586,202.40 = 354,643.20/x
  3. Step 3: Cross multiply
    390,801.60x = 586,202.40 × 354,643.20
  4. Step 4: Simplify right side
    390,801.60x = 207,892,694,983.68
  5. Step 5: Solve for x
    x = 207,892,694,983.68/390,801.60
  6. Step 6: Final answer
    x = 531,964.80

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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.