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Finding the Fourth Proportional to 716,810.30, 989,198.28 and 390,124.52

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Solution

The fourth proportional to 716,810.30, 989,198.28 and 390,124.52 is: 538,371.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,810.30 : 989,198.28 = 390,124.52 : x
  2. Step 2: Convert to fraction form
    716,810.30/989,198.28 = 390,124.52/x
  3. Step 3: Cross multiply
    716,810.30x = 989,198.28 × 390,124.52
  4. Step 4: Simplify right side
    716,810.30x = 385,910,504,169.83
  5. Step 5: Solve for x
    x = 385,910,504,169.83/716,810.30
  6. Step 6: Final answer
    x = 538,371.87

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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.