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Finding the Fourth Proportional to 491,434.80, 678,389.28 and 330,383.26

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Solution

The fourth proportional to 491,434.80, 678,389.28 and 330,383.26 is: 456,069.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    491,434.80 : 678,389.28 = 330,383.26 : x
  2. Step 2: Convert to fraction form
    491,434.80/678,389.28 = 330,383.26/x
  3. Step 3: Cross multiply
    491,434.80x = 678,389.28 × 330,383.26
  4. Step 4: Simplify right side
    491,434.80x = 224,128,461,875.45
  5. Step 5: Solve for x
    x = 224,128,461,875.45/491,434.80
  6. Step 6: Final answer
    x = 456,069.58

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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.