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Finding the Fourth Proportional to 638,400.72, 880,999.14 and 351,931.14

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Solution

The fourth proportional to 638,400.72, 880,999.14 and 351,931.14 is: 485,668.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    638,400.72 : 880,999.14 = 351,931.14 : x
  2. Step 2: Convert to fraction form
    638,400.72/880,999.14 = 351,931.14/x
  3. Step 3: Cross multiply
    638,400.72x = 880,999.14 × 351,931.14
  4. Step 4: Simplify right side
    638,400.72x = 310,051,031,679.22
  5. Step 5: Solve for x
    x = 310,051,031,679.22/638,400.72
  6. Step 6: Final answer
    x = 485,668.36

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.