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Finding the Fourth Proportional to 480,903.40, 720,404.70 and 421,805.80

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Solution

The fourth proportional to 480,903.40, 720,404.70 and 421,805.80 is: 631,875.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    480,903.40 : 720,404.70 = 421,805.80 : x
  2. Step 2: Convert to fraction form
    480,903.40/720,404.70 = 421,805.80/x
  3. Step 3: Cross multiply
    480,903.40x = 720,404.70 × 421,805.80
  4. Step 4: Simplify right side
    480,903.40x = 303,870,880,807.26
  5. Step 5: Solve for x
    x = 303,870,880,807.26/480,903.40
  6. Step 6: Final answer
    x = 631,875.09

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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.