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Finding the Fourth Proportional to 716,644.33, 988,956.65 and 389,946.31

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Solution

The fourth proportional to 716,644.33, 988,956.65 and 389,946.31 is: 538,119.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,644.33 : 988,956.65 = 389,946.31 : x
  2. Step 2: Convert to fraction form
    716,644.33/988,956.65 = 389,946.31/x
  3. Step 3: Cross multiply
    716,644.33x = 988,956.65 × 389,946.31
  4. Step 4: Simplify right side
    716,644.33x = 385,639,996,417.46
  5. Step 5: Solve for x
    x = 385,639,996,417.46/716,644.33
  6. Step 6: Final answer
    x = 538,119.09

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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.