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Finding the Fourth Proportional to 716,053.60, 988,128.40 and 393,760.88

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Solution

The fourth proportional to 716,053.60, 988,128.40 and 393,760.88 is: 543,375.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,053.60 : 988,128.40 = 393,760.88 : x
  2. Step 2: Convert to fraction form
    716,053.60/988,128.40 = 393,760.88/x
  3. Step 3: Cross multiply
    716,053.60x = 988,128.40 × 393,760.88
  4. Step 4: Simplify right side
    716,053.60x = 389,086,301,427.55
  5. Step 5: Solve for x
    x = 389,086,301,427.55/716,053.60
  6. Step 6: Final answer
    x = 543,375.95

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1.5x scale

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.