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Finding the Fourth Proportional to 621,859.80, 931,407.30 and 538,915.80

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Solution

The fourth proportional to 621,859.80, 931,407.30 and 538,915.80 is: 807,175.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,859.80 : 931,407.30 = 538,915.80 : x
  2. Step 2: Convert to fraction form
    621,859.80/931,407.30 = 538,915.80/x
  3. Step 3: Cross multiply
    621,859.80x = 931,407.30 × 538,915.80
  4. Step 4: Simplify right side
    621,859.80x = 501,950,110,205.34
  5. Step 5: Solve for x
    x = 501,950,110,205.34/621,859.80
  6. Step 6: Final answer
    x = 807,175.69

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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.