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Finding the Fourth Proportional to 716,420.64, 988,635.44 and 394,127.28

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Solution

The fourth proportional to 716,420.64, 988,635.44 and 394,127.28 is: 543,881.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    716,420.64 : 988,635.44 = 394,127.28 : x
  2. Step 2: Convert to fraction form
    716,420.64/988,635.44 = 394,127.28/x
  3. Step 3: Cross multiply
    716,420.64x = 988,635.44 × 394,127.28
  4. Step 4: Simplify right side
    716,420.64x = 389,648,196,878.80
  5. Step 5: Solve for x
    x = 389,648,196,878.80/716,420.64
  6. Step 6: Final answer
    x = 543,881.87

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Double scale
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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.