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Finding the Fourth Proportional to 716,963.59, 989,422.34 and 390,286

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Solution

The fourth proportional to 716,963.59, 989,422.34 and 390,286 is: 538,601.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,963.59 : 989,422.34 = 390,286 : x
  2. Step 2: Convert to fraction form
    716,963.59/989,422.34 = 390,286/x
  3. Step 3: Cross multiply
    716,963.59x = 989,422.34 × 390,286
  4. Step 4: Simplify right side
    716,963.59x = 386,157,687,389.24
  5. Step 5: Solve for x
    x = 386,157,687,389.24/716,963.59
  6. Step 6: Final answer
    x = 538,601.53

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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.