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Finding the Fourth Proportional to 423,487.80, 635,231.70 and 390,682.80

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Solution

The fourth proportional to 423,487.80, 635,231.70 and 390,682.80 is: 586,024.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    423,487.80 : 635,231.70 = 390,682.80 : x
  2. Step 2: Convert to fraction form
    423,487.80/635,231.70 = 390,682.80/x
  3. Step 3: Cross multiply
    423,487.80x = 635,231.70 × 390,682.80
  4. Step 4: Simplify right side
    423,487.80x = 248,174,099,204.76
  5. Step 5: Solve for x
    x = 248,174,099,204.76/423,487.80
  6. Step 6: Final answer
    x = 586,024.20

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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.