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Finding the Fourth Proportional to 662,479.30, 913,915.74 and 390,361.42

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Solution

The fourth proportional to 662,479.30, 913,915.74 and 390,361.42 is: 538,518.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    662,479.30 : 913,915.74 = 390,361.42 : x
  2. Step 2: Convert to fraction form
    662,479.30/913,915.74 = 390,361.42/x
  3. Step 3: Cross multiply
    662,479.30x = 913,915.74 × 390,361.42
  4. Step 4: Simplify right side
    662,479.30x = 356,757,446,026.75
  5. Step 5: Solve for x
    x = 356,757,446,026.75/662,479.30
  6. Step 6: Final answer
    x = 538,518.63

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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.