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Finding the Fourth Proportional to 716,153.52, 988,316.68 and 393,888

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Solution

The fourth proportional to 716,153.52, 988,316.68 and 393,888 is: 543,579.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,153.52 : 988,316.68 = 393,888 : x
  2. Step 2: Convert to fraction form
    716,153.52/988,316.68 = 393,888/x
  3. Step 3: Cross multiply
    716,153.52x = 988,316.68 × 393,888
  4. Step 4: Simplify right side
    716,153.52x = 389,286,080,451.84
  5. Step 5: Solve for x
    x = 389,286,080,451.84/716,153.52
  6. Step 6: Final answer
    x = 543,579.09

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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.