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Finding the Fourth Proportional to 716,968.59, 989,429.24 and 390,291

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Solution

The fourth proportional to 716,968.59, 989,429.24 and 390,291 is: 538,608.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,968.59 : 989,429.24 = 390,291 : x
  2. Step 2: Convert to fraction form
    716,968.59/989,429.24 = 390,291/x
  3. Step 3: Cross multiply
    716,968.59x = 989,429.24 × 390,291
  4. Step 4: Simplify right side
    716,968.59x = 386,165,327,508.84
  5. Step 5: Solve for x
    x = 386,165,327,508.84/716,968.59
  6. Step 6: Final answer
    x = 538,608.43

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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.