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Finding the Fourth Proportional to 718,258.75, 991,204.71 and 395,980.38

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Solution

The fourth proportional to 718,258.75, 991,204.71 and 395,980.38 is: 546,457.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    718,258.75 : 991,204.71 = 395,980.38 : x
  2. Step 2: Convert to fraction form
    718,258.75/991,204.71 = 395,980.38/x
  3. Step 3: Cross multiply
    718,258.75x = 991,204.71 × 395,980.38
  4. Step 4: Simplify right side
    718,258.75x = 392,497,617,723.59
  5. Step 5: Solve for x
    x = 392,497,617,723.59/718,258.75
  6. Step 6: Final answer
    x = 546,457.13

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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.