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Finding the Fourth Proportional to 718,915.16, 991,926 and 439,441.46

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Solution

The fourth proportional to 718,915.16, 991,926 and 439,441.46 is: 606,321.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,915.16 : 991,926 = 439,441.46 : x
  2. Step 2: Convert to fraction form
    718,915.16/991,926 = 439,441.46/x
  3. Step 3: Cross multiply
    718,915.16x = 991,926 × 439,441.46
  4. Step 4: Simplify right side
    718,915.16x = 435,893,409,651.96
  5. Step 5: Solve for x
    x = 435,893,409,651.96/718,915.16
  6. Step 6: Final answer
    x = 606,321.07

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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.