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Finding the Fourth Proportional to 660,991.92, 991,310.76 and 286,926

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Solution

The fourth proportional to 660,991.92, 991,310.76 and 286,926 is: 430,312.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    660,991.92 : 991,310.76 = 286,926 : x
  2. Step 2: Convert to fraction form
    660,991.92/991,310.76 = 286,926/x
  3. Step 3: Cross multiply
    660,991.92x = 991,310.76 × 286,926
  4. Step 4: Simplify right side
    660,991.92x = 284,432,831,123.76
  5. Step 5: Solve for x
    x = 284,432,831,123.76/660,991.92
  6. Step 6: Final answer
    x = 430,312.12

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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.