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Finding the Fourth Proportional to 480,699.90, 720,099.45 and 421,602.30

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Solution

The fourth proportional to 480,699.90, 720,099.45 and 421,602.30 is: 631,569.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,699.90 : 720,099.45 = 421,602.30 : x
  2. Step 2: Convert to fraction form
    480,699.90/720,099.45 = 421,602.30/x
  3. Step 3: Cross multiply
    480,699.90x = 720,099.45 × 421,602.30
  4. Step 4: Simplify right side
    480,699.90x = 303,595,584,348.74
  5. Step 5: Solve for x
    x = 303,595,584,348.74/480,699.90
  6. Step 6: Final answer
    x = 631,569.89

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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.