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Finding the Fourth Proportional to 716,442.49, 988,690.64 and 394,145.66

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Solution

The fourth proportional to 716,442.49, 988,690.64 and 394,145.66 is: 543,921.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,442.49 : 988,690.64 = 394,145.66 : x
  2. Step 2: Convert to fraction form
    716,442.49/988,690.64 = 394,145.66/x
  3. Step 3: Cross multiply
    716,442.49x = 988,690.64 × 394,145.66
  4. Step 4: Simplify right side
    716,442.49x = 389,688,122,867.89
  5. Step 5: Solve for x
    x = 389,688,122,867.89/716,442.49
  6. Step 6: Final answer
    x = 543,921.01

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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.