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Finding the Fourth Proportional to 716,965.59, 989,425.10 and 390,288

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Solution

The fourth proportional to 716,965.59, 989,425.10 and 390,288 is: 538,604.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,965.59 : 989,425.10 = 390,288 : x
  2. Step 2: Convert to fraction form
    716,965.59/989,425.10 = 390,288/x
  3. Step 3: Cross multiply
    716,965.59x = 989,425.10 × 390,288
  4. Step 4: Simplify right side
    716,965.59x = 386,160,743,428.80
  5. Step 5: Solve for x
    x = 386,160,743,428.80/716,965.59
  6. Step 6: Final answer
    x = 538,604.29

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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.