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Finding the Fourth Proportional to 640,299.84, 960,988.40 and 320,355.76

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Solution

The fourth proportional to 640,299.84, 960,988.40 and 320,355.76 is: 480,803.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,299.84 : 960,988.40 = 320,355.76 : x
  2. Step 2: Convert to fraction form
    640,299.84/960,988.40 = 320,355.76/x
  3. Step 3: Cross multiply
    640,299.84x = 960,988.40 × 320,355.76
  4. Step 4: Simplify right side
    640,299.84x = 307,858,169,233.18
  5. Step 5: Solve for x
    x = 307,858,169,233.18/640,299.84
  6. Step 6: Final answer
    x = 480,803.13

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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.