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Finding the Fourth Proportional to 661,638.40, 992,457.60 and 380,924.80

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Solution

The fourth proportional to 661,638.40, 992,457.60 and 380,924.80 is: 571,387.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    661,638.40 : 992,457.60 = 380,924.80 : x
  2. Step 2: Convert to fraction form
    661,638.40/992,457.60 = 380,924.80/x
  3. Step 3: Cross multiply
    661,638.40x = 992,457.60 × 380,924.80
  4. Step 4: Simplify right side
    661,638.40x = 378,051,712,788.48
  5. Step 5: Solve for x
    x = 378,051,712,788.48/661,638.40
  6. Step 6: Final answer
    x = 571,387.20

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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.