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Finding the Fourth Proportional to 718,235.40, 991,158.17 and 391,548.43

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Solution

The fourth proportional to 718,235.40, 991,158.17 and 391,548.43 is: 540,333.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,235.40 : 991,158.17 = 391,548.43 : x
  2. Step 2: Convert to fraction form
    718,235.40/991,158.17 = 391,548.43/x
  3. Step 3: Cross multiply
    718,235.40x = 991,158.17 × 391,548.43
  4. Step 4: Simplify right side
    718,235.40x = 388,086,426,828.84
  5. Step 5: Solve for x
    x = 388,086,426,828.84/718,235.40
  6. Step 6: Final answer
    x = 540,333.19

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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.