Home / 781,393.80-1,172,090.70-220,428.30

Finding the Fourth Proportional to 781,393.80, 1,172,090.70 and 220,428.30

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Solution

The fourth proportional to 781,393.80, 1,172,090.70 and 220,428.30 is: 330,642.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    781,393.80 : 1,172,090.70 = 220,428.30 : x
  2. Step 2: Convert to fraction form
    781,393.80/1,172,090.70 = 220,428.30/x
  3. Step 3: Cross multiply
    781,393.80x = 1,172,090.70 × 220,428.30
  4. Step 4: Simplify right side
    781,393.80x = 258,361,960,446.81
  5. Step 5: Solve for x
    x = 258,361,960,446.81/781,393.80
  6. Step 6: Final answer
    x = 330,642.45

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.