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Finding the Fourth Proportional to 811,862.60, 1,215,461.10 and 727,881.80

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Solution

The fourth proportional to 811,862.60, 1,215,461.10 and 727,881.80 is: 1,089,731.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    811,862.60 : 1,215,461.10 = 727,881.80 : x
  2. Step 2: Convert to fraction form
    811,862.60/1,215,461.10 = 727,881.80/x
  3. Step 3: Cross multiply
    811,862.60x = 1,215,461.10 × 727,881.80
  4. Step 4: Simplify right side
    811,862.60x = 884,712,013,297.98
  5. Step 5: Solve for x
    x = 884,712,013,297.98/811,862.60
  6. Step 6: Final answer
    x = 1,089,731.21

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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.